maintenance: add auto-updating of npm packages (#1626)

Author: stephenplusplus

packages/google-cloud-vision/package.json

@@ -53,10 +53,10 @@
     "@google-cloud/common": "^0.5.0",
     "arguejs": "^0.2.3",
     "arrify": "^1.0.0",
-    "async": "^1.4.2",
+    "async": "^2.0.1",
     "extend": "^3.0.0",
     "google-gax": "^0.6.0",
-    "google-proto-files": "^0.7.0",
+    "google-proto-files": "^0.8.0",
     "is": "^3.0.1",
     "propprop": "^0.3.0",
     "request": "^2.70.0",