Bump metro@0.28.0

Reviewed By: davidaurelio

Differential Revision: D7085296

fbshipit-source-id: 76032af022d37a28976b33176f9a573e39861a39

package.json

@@ -174,8 +174,8 @@
     "graceful-fs": "^4.1.3",
     "inquirer": "^3.0.6",
     "lodash": "^4.17.5",
-    "metro": "^0.27.0",
-    "metro-core": "^0.27.0",
+    "metro": "^0.28.0",
+    "metro-core": "^0.28.0",
     "mime": "^1.3.4",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",