chore(deps): update dependency proxyquire to v2

Author: renovate-bot

package-lock.json

@@ -58,7 +58,7 @@
     "lint-staged": "7.1.1",
     "mocha": "5.2.0",
     "prettier-standard": "8.0.1",
-    "proxyquire": "1.8.0"
+    "proxyquire": "2.0.1"
   },
   "eslintConfig": {
     "extends": "standard",