react-hot-loader & warnings (#3110)

lib/app.js

@@ -84,7 +84,7 @@ class Container extends Component {
       // includes AppContainer which bypasses shouldComponentUpdate method
       // https://github.com/gaearon/react-hot-loader/issues/442
       return (
-        <AppContainer errorReporter={ErrorDebug}>
+        <AppContainer warnings={false} errorReporter={ErrorDebug}>
           <Component {...props} url={url} />
         </AppContainer>
       )