Fix Flow hopefully

Author: gaearon

packages/react-error-overlay/package.json

@@ -33,7 +33,7 @@
     "anser": "1.2.5",
     "babel-code-frame": "6.22.0",
     "babel-runtime": "6.23.0",
-    "react-dev-utils": "^0.5.2",
+    "react-dev-utils": "^1.0.0",
     "settle-promise": "1.0.0"
   },
   "devDependencies": {