chore(package): update reify to version 0.20.0

Closes #57

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
   "devDependencies": {
     "docco": "^0.8.0",
     "mocha": "^5.0.0",
-    "reify": "^0.18.1",
+    "reify": "^0.20.0",
     "terser": "^3.16.0"
   },
   "license": "MIT",