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/status_list.js

@@ -20,11 +20,11 @@ class StatusList extends ImmutablePureComponent {
     isUnread: PropTypes.bool,
     hasMore: PropTypes.bool,
     prepend: PropTypes.node,
-    emptyMessage: PropTypes.node
+    emptyMessage: PropTypes.node,
   };
 
   static defaultProps = {
-    trackScroll: true
+    trackScroll: true,
   };
 
   handleScroll = (e) => {