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/compose_form.js

@@ -53,7 +53,7 @@ class ComposeForm extends ImmutablePureComponent {
   };
 
   static defaultProps = {
-    showSearch: false
+    showSearch: false,
   };
 
   handleChange = (e) => {