Update google-proto-files to the latest version 🚀 (#20)

Author: greenkeeper[bot]

packages/google-cloud-speech/package.json

@@ -64,7 +64,7 @@
   "dependencies": {
     "extend": "^3.0.0",
     "google-gax": "^0.14.2",
-    "google-proto-files": "^0.14.1",
+    "google-proto-files": "^0.15.0",
     "lodash.merge": "^4.6.0",
     "protobufjs": "^6.8.0",
     "pumpify": "^1.3.5",