Update dependencies to enable Greenkeeper 🌴 (#8)

* chore(package): update dependencies

Author: greenkeeper[bot]

packages/google-cloud-node/package.json

@@ -62,7 +62,7 @@
   "dependencies": {
     "extend": "^3.0.0",
     "google-gax": "^0.14.2",
-    "google-proto-files": "^0.13.1",
+    "google-proto-files": "^0.14.1",
     "lodash.merge": "^4.6.0",
     "protobufjs": "^6.8.0",
     "pumpify": "^1.3.5",
@@ -80,11 +80,11 @@
     "ink-docstrap": "^1.3.0",
     "intelli-espower-loader": "^1.0.1",
     "jsdoc": "^3.5.5",
-    "mocha": "^3.5.3",
+    "mocha": "^4.0.1",
     "nyc": "^11.3.0",
     "power-assert": "^1.4.4",
     "prettier": "^1.7.4",
     "safe-buffer": "^5.1.1",
-    "sinon": "^2.2.0"
+    "sinon": "^4.1.2"
   }
 }