chore(package): update proxyquire to version 2.0.0 (#148)

Author: greenkeeper[bot]

package.json

@@ -79,7 +79,7 @@
     "power-assert": "^1.4.4",
     "prettier": "^1.10.2",
     "protobufjs": "^6.8.4",
-    "proxyquire": "^1.8.0",
+    "proxyquire": "^2.0.0",
     "typescript": "^2.6.2"
   }
 }