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/features/compose/components/upload_progress.js

@@ -8,7 +8,7 @@ class UploadProgress extends React.PureComponent {
 
   static propTypes = {
     active: PropTypes.bool,
-    progress: PropTypes.number
+    progress: PropTypes.number,
   };
 
   render () {