diff --git a/package-lock.json b/package-lock.json
index 93a419b..b2a6dd6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -136,6 +136,12 @@
         "to-fast-properties": "2.0.0"
       }
     },
+    "@tootallnate/once": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
+      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.1.6.tgz",
@@ -371,11 +377,21 @@
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+    "agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "dev": true,
+      "requires": {
+        "debug": "4"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
       "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
+      "optional": true,
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         "fast-deep-equal": "1.1.0",
@@ -445,7 +461,7 @@
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       "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
-      "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
+      "integrity": "sha512-dEamhpPEwRUBpLNHeuCm/v+g0anFByHahxodVO/BbAarHVBBg2MccCwf9K+o1Pof+2btdnkJelYVUWjW/VrATw==",
       "dev": true
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@@ -544,7 +560,7 @@
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-      "resolved": "http://registry.npmjs.org/async/-/async-1.0.0.tgz",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
       "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
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@@ -558,7 +574,8 @@
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       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -570,13 +587,15 @@
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       "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
+      "dev": true,
+      "optional": true
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       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
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-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -603,7 +622,7 @@
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-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
           "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
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@@ -616,7 +635,7 @@
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-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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@@ -945,7 +964,8 @@
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       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1087,7 +1107,8 @@
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       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1096,16 +1117,28 @@
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-      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.1.0.tgz",
-      "integrity": "sha512-aWQc/rtHbcWEQLka6WmBAOpV58J2TwyXqlpAQGhQaSiEUoigTTUk6lLd2vB3kXkhnDyzyH74RXfmV4dq2txmdA==",
+      "version": "3.8.3",
+      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.8.3.tgz",
+      "integrity": "sha512-Y8Hw+V3HgR7V71xWH2vQ9lyS358CbGCldWlJFR0JirqoGtOoas3R3/OclRTvgUYFK29mmJICDPauVKmpqbwhOA==",
       "dev": true,
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-        "ignore-walk": "3.0.1",
-        "js-yaml": "3.12.0",
-        "request": "2.88.0",
-        "urlgrey": "0.4.4"
+        "ignore-walk": "3.0.4",
+        "js-yaml": "3.14.1",
+        "teeny-request": "7.1.1",
+        "urlgrey": "1.0.0"
+      },
+      "dependencies": {
+        "js-yaml": {
+          "version": "3.14.1",
+          "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz",
+          "integrity": "sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==",
+          "dev": true,
+          "requires": {
+            "argparse": "^1.0.7",
+            "esprima": "^4.0.0"
+          }
+        }
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@@ -1145,6 +1178,7 @@
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       "dev": true,
+      "optional": true,
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       }
@@ -1457,7 +1491,8 @@
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       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1829,7 +1864,8 @@
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-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1946,7 +1982,8 @@
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       "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1959,7 +1996,8 @@
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       "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -1973,6 +2011,15 @@
       "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
       "dev": true
     },
+    "fast-url-parser": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/fast-url-parser/-/fast-url-parser-1.1.3.tgz",
+      "integrity": "sha512-5jOCVXADYNuRkKFzNJ0dCCewsZiYo0dz8QNYljkOpFC6r2U4OBmKtvm/Tsuh4w1YYdDqDb31a8TVhBJ2OJKdqQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^1.3.2"
+      }
+    },
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@@ -2084,13 +2131,15 @@
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       "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=",
-      "dev": true
+      "dev": true,
+      "optional": true
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       "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.2.tgz",
       "integrity": "sha1-SXBJi+YEwgwAXU9cI67NIda0kJk=",
       "dev": true,
+      "optional": true,
       "requires": {
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@@ -2099,9 +2148,10 @@
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-          "resolved": "http://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
           "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -2209,7 +2259,8 @@
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           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2230,12 +2281,14 @@
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           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "1.0.0",
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@@ -2250,17 +2303,20 @@
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           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "core-util-is": {
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@@ -2377,7 +2433,8 @@
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           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -2389,6 +2446,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2403,6 +2461,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2410,12 +2469,14 @@
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           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.2.4",
           "bundled": true,
           "dev": true,
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@@ -2434,6 +2495,7 @@
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           "dev": true,
+          "optional": true,
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@@ -2514,7 +2576,8 @@
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           "version": "1.0.1",
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-          "dev": true
+          "dev": true,
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@@ -2526,6 +2589,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2611,7 +2675,8 @@
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-          "dev": true
+          "dev": true,
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@@ -2647,6 +2712,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2666,6 +2732,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -2709,12 +2776,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -2843,13 +2912,15 @@
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       "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
-      "dev": true
+      "dev": true,
+      "optional": true
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       "dev": true,
+      "optional": true,
       "requires": {
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         "har-schema": "2.0.0"
@@ -2971,11 +3042,23 @@
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+    "http-proxy-agent": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-4.0.1.tgz",
+      "integrity": "sha512-k0zdNgqWTGA6aeIRVpvfVob4fL52dTfaehylg0Y4UvSySvOq/Y+BOyPrgpUrA7HylqvU8vIZGsRuXmspskV0Tg==",
+      "dev": true,
+      "requires": {
+        "@tootallnate/once": "1",
+        "agent-base": "6",
+        "debug": "4"
+      }
+    },
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       "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
       "dev": true,
+      "optional": true,
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@@ -2988,6 +3071,16 @@
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       "dev": true
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+    "https-proxy-agent": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
+      "integrity": "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA==",
+      "dev": true,
+      "requires": {
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+        "debug": "4"
+      }
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@@ -3001,12 +3094,12 @@
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-      "integrity": "sha512-DTVlMx3IYPe0/JJcYP7Gxg7ttZZu3IInhuEhbchuqneY9wWe5Ojy2mXLBaQFUQmo0AW2r3qG7m1mg86js+gnlQ==",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/ignore-walk/-/ignore-walk-3.0.4.tgz",
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       "dev": true,
       "requires": {
-        "minimatch": "3.0.4"
+        "minimatch": "^3.0.4"
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@@ -3253,7 +3346,8 @@
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-      "dev": true
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@@ -3283,7 +3377,8 @@
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-      "dev": true
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@@ -3427,19 +3522,22 @@
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-      "dev": true
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       "integrity": "sha1-NJptRMU6Ud6JtAgFxdXlm0F9M0A=",
-      "dev": true
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       "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
-      "dev": true
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@@ -3462,6 +3560,7 @@
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       "integrity": "sha1-MT5mvB5cwG5Di8G3SZwuXFastqI=",
       "dev": true,
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@@ -3776,13 +3875,15 @@
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-      "dev": true
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@@ -4448,7 +4559,8 @@
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@@ -4532,6 +4644,7 @@
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@@ -4578,7 +4691,8 @@
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@@ -4844,7 +4958,8 @@
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@@ -5230,7 +5345,8 @@
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-      "dev": true
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@@ -6403,6 +6523,15 @@
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+      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
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+      "dev": true,
+      "requires": {
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@@ -6491,6 +6620,12 @@
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+      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
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+    "teeny-request": {
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+      "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-7.1.1.tgz",
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+      "dev": true,
+      "requires": {
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+        "https-proxy-agent": "^5.0.0",
+        "node-fetch": "^2.6.1",
+        "stream-events": "^1.0.5",
+        "uuid": "^8.0.0"
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+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
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+        }
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@@ -6630,11 +6786,18 @@
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+    "tr46": {
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+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
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+    },
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@@ -6724,6 +6887,7 @@
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@@ -7003,10 +7167,13 @@
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-      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
-      "dev": true
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-1.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+      }
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@@ -7033,7 +7200,8 @@
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@@ -7046,6 +7214,7 @@
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       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
+      "optional": true,
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@@ -7072,6 +7241,12 @@
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+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.20.2.tgz",
@@ -7325,6 +7500,16 @@
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+    "whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "dev": true,
+      "requires": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
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@@ -7408,7 +7593,7 @@
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-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
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diff --git a/package.json b/package.json
index 89b7d58..ecef6b9 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
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     "clone": "^2.1.2",
-    "codecov": "^3.1.0",
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     "debug": "^4.1.0",
     "istanbul": "^0.4.5",