Merge pull request #3761 from matrix-org/travis/babel7-wp-es6-export

Convert CommonJS exports to ES6 exports

src/components/structures/UploadBar.js

@@ -1,5 +1,6 @@
 /*
 Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -22,7 +23,7 @@ import dis from "../../dispatcher";
 import filesize from "filesize";
 import { _t } from '../../languageHandler';
 
-module.exports = createReactClass({
+export default createReactClass({
     displayName: 'UploadBar',
     propTypes: {
         room: PropTypes.object,