datastore: update dependencies

Author: stephenplusplus

package.json

@@ -50,10 +50,12 @@
     "datastore"
   ],
   "dependencies": {
-    "@google-cloud/common": "^0.2.0",
+    "@google-cloud/common": "^0.4.0",
     "arrify": "^1.0.0",
+    "async": "^2.0.1",
     "concat-stream": "^1.5.0",
-    "create-error-class": "^2.0.1",
+    "create-error-class": "^3.0.2",
+    "deep-strict-equal": "^0.2.0",
     "extend": "^3.0.0",
     "is": "^3.0.1",
     "lodash.flatten": "^4.2.0",
@@ -63,8 +65,6 @@
     "split-array-stream": "^1.0.0"
   },
   "devDependencies": {
-    "async": "^1.4.2",
-    "deep-strict-equal": "^0.1.0",
     "mocha": "^3.0.1",
     "proxyquire": "^1.7.10",
     "through2": "^2.0.0"