Improve eslint rules (#3147)

* Add semi to ESLint rules

* Add padded-blocks to ESLint rules

* Add comma-dangle to ESLint rules

* add config/webpack and storyboard

* add streaming/

* yarn test:lint -- --fix

app/javascript/mastodon/components/display_name.js

@@ -6,7 +6,7 @@ import emojify from '../emoji';
 class DisplayName extends React.PureComponent {
 
   static propTypes = {
-    account: ImmutablePropTypes.map.isRequired
+    account: ImmutablePropTypes.map.isRequired,
   };
 
   render () {