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

Convert CommonJS exports to ES6 exports

src/components/views/rooms/RoomTopicEditor.js

@@ -20,7 +20,7 @@ import createReactClass from 'create-react-class';
 import * as sdk from '../../../index';
 import { _t } from "../../../languageHandler";
 
-module.exports = createReactClass({
+export default createReactClass({
     displayName: 'RoomTopicEditor',
 
     propTypes: {