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/permalink.js

@@ -4,14 +4,14 @@ import PropTypes from 'prop-types';
 class Permalink extends React.PureComponent {
 
   static contextTypes = {
-    router: PropTypes.object
+    router: PropTypes.object,
   };
 
   static propTypes = {
     className: PropTypes.string,
     href: PropTypes.string.isRequired,
     to: PropTypes.string.isRequired,
-    children: PropTypes.node
+    children: PropTypes.node,
   };
 
   handleClick = (e) => {