Update config.js

code review fix

.storybook/config.js

 import moment from 'moment';
-import { configure, addDecorator, setAddon  } from '@kadira/storybook';
+import { configure, addDecorator, setAddon } from '@kadira/storybook';
 import infoAddon from '@kadira/react-storybook-addon-info';
 import '../css/styles.scss';