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/ui/components/confirmation_modal.js

@@ -10,7 +10,7 @@ class ConfirmationModal extends React.PureComponent {
     confirm: PropTypes.string.isRequired,
     onClose: PropTypes.func.isRequired,
     onConfirm: PropTypes.func.isRequired,
-    intl: PropTypes.object.isRequired
+    intl: PropTypes.object.isRequired,
   };
 
   handleClick = () => {