diff --git a/package-lock.json b/package-lock.json
index 59f2bec..7b06c1e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "sigfile",
-  "version": "0.1.4",
+  "version": "0.1.9",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2645,15 +2645,36 @@
       }
     },
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-      "version": "4.12.0",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.12.0.tgz",
-      "integrity": "sha512-UH2GkcEDSI0k/lRkuDSzFl9ZZ87skSy9w2XAn1MsZnL+4c4rqbBd3e82UWHbYDpztABrPBhZsTEeuxVfHppqDg==",
+      "version": "4.16.6",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.16.6.tgz",
+      "integrity": "sha512-Wspk/PqO+4W9qp5iUTJsa1B/QrYn1keNCcEP5OvP7WBwT4KaDly0uONYmC6Xa3Z5IqnUgS0KcgLYu1l74x0ZXQ==",
       "dev": true,
       "requires": {
-        "caniuse-lite": "^1.0.30001043",
-        "electron-to-chromium": "^1.3.413",
-        "node-releases": "^1.1.53",
-        "pkg-up": "^2.0.0"
+        "caniuse-lite": "^1.0.30001219",
+        "colorette": "^1.2.2",
+        "electron-to-chromium": "^1.3.723",
+        "escalade": "^3.1.1",
+        "node-releases": "^1.1.71"
+      },
+      "dependencies": {
+        "caniuse-lite": {
+          "version": "1.0.30001230",
+          "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001230.tgz",
+          "integrity": "sha512-5yBd5nWCBS+jWKTcHOzXwo5xzcj4ePE/yjtkZyUV1BTUmrBaA9MRGC+e7mxnqXSA90CmCA8L3eKLaSUkt099IQ==",
+          "dev": true
+        },
+        "electron-to-chromium": {
+          "version": "1.3.739",
+          "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.739.tgz",
+          "integrity": "sha512-+LPJVRsN7hGZ9EIUUiWCpO7l4E3qBYHNadazlucBfsXBbccDFNKUBAgzE68FnkWGJPwD/AfKhSzL+G+Iqb8A4A==",
+          "dev": true
+        },
+        "node-releases": {
+          "version": "1.1.72",
+          "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.72.tgz",
+          "integrity": "sha512-LLUo+PpH3dU6XizX3iVoubUNheF/owjXCZZ5yACDxNnPtgFuludV1ZL3ayK1kVep42Rmm0+R9/Y60NQbZ2bifw==",
+          "dev": true
+        }
       }
     },
     "bser": {
@@ -2918,12 +2939,6 @@
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       "dev": true
     },
-    "caniuse-lite": {
-      "version": "1.0.30001046",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001046.tgz",
-      "integrity": "sha512-CsGjBRYWG6FvgbyGy+hBbaezpwiqIOLkxQPY4A4Ea49g1eNsnQuESB+n4QM0BKii1j80MyJ26Ir5ywTQkbRE4g==",
-      "dev": true
-    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/capture-exit/-/capture-exit-2.0.0.tgz",
@@ -3844,6 +3859,12 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "colorette": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.2.2.tgz",
+      "integrity": "sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==",
+      "dev": true
+    },
     "colors": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
@@ -4407,12 +4428,6 @@
         "url-join": "^2.0.5"
       }
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-    "electron-to-chromium": {
-      "version": "1.3.415",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.415.tgz",
-      "integrity": "sha512-GbtYqKffx3sU8G0HxwXuJFfs58Q7+iwLa5rBwaULwET6jWW8IAQSrVnu7vEfiUIcMVfbYyFg7cw3zdm+EbBJmw==",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
@@ -4520,6 +4535,12 @@
         "is-arrayish": "^0.2.1"
       }
     },
+    "escalade": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
+      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
+      "dev": true
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -5141,15 +5162,6 @@
         }
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-    "find-up": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
-      "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
-      "dev": true,
-      "requires": {
-        "locate-path": "^2.0.0"
-      }
-    },
     "findup-sync": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/findup-sync/-/findup-sync-3.0.0.tgz",
@@ -8559,16 +8571,6 @@
         }
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-    "locate-path": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-2.0.0.tgz",
-      "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
-      "dev": true,
-      "requires": {
-        "p-locate": "^2.0.0",
-        "path-exists": "^3.0.0"
-      }
-    },
     "lodash": {
       "version": "4.17.15",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
@@ -9130,12 +9132,6 @@
         }
       }
     },
-    "node-releases": {
-      "version": "1.1.53",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-1.1.53.tgz",
-      "integrity": "sha512-wp8zyQVwef2hpZ/dJH7SfSrIPD6YoJz6BDQDpGEkcA0s3LpAQoxBIYmfIq6QAhC1DhwsyCgTaTTcONwX8qzCuQ==",
-      "dev": true
-    },
     "normalize-package-data": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/normalize-package-data/-/normalize-package-data-2.5.0.tgz",
@@ -9357,30 +9353,6 @@
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       "dev": true
     },
-    "p-limit": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-1.3.0.tgz",
-      "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
-      "dev": true,
-      "requires": {
-        "p-try": "^1.0.0"
-      }
-    },
-    "p-locate": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-2.0.0.tgz",
-      "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
-      "dev": true,
-      "requires": {
-        "p-limit": "^1.1.0"
-      }
-    },
-    "p-try": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
-      "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
-      "dev": true
-    },
     "pako": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
@@ -9634,15 +9606,6 @@
         }
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-    "pkg-up": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/pkg-up/-/pkg-up-2.0.0.tgz",
-      "integrity": "sha1-yBmscoBZpGHKscOImivjxJoATX8=",
-      "dev": true,
-      "requires": {
-        "find-up": "^2.1.0"
-      }
-    },
     "pn": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pn/-/pn-1.1.0.tgz",