eslint: enforce gaps between groups with import/order

app/soapbox/components/button.js

@@ -2,6 +2,7 @@ import classNames from 'classnames';
 import PropTypes from 'prop-types';
 import React from 'react';
 import { Link } from 'react-router-dom';
+
 import Icon from './icon';
 
 export default class Button extends React.PureComponent {