chore(package): update proxyquire to version 2.0.0 (#1511)

Author: greenkeeper[bot]

package.json

@@ -82,7 +82,7 @@
     "jsdoc": "^3.5.5",
     "mocha": "^5.0.0",
     "prebuild": "^7.4.0",
-    "proxyquire": "^1.7.10",
+    "proxyquire": "^2.0.0",
     "sinon": "^4.2.2"
   },
   "engines": {