repo: setup greenkeeper.json to update dependencies in samples/package.json (#94)

Author: jkwlui

packages/google-cloud-vision/greenkeeper.json

@@ -0,0 +1,10 @@
+{
+  "groups": {
+    "default": {
+      "packages": [
+        "package.json",
+        "samples/package.json"
+      ]
+    }
+  }
+}