Missing React import

src/components/structures/GroupView.js

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import React from 'react';
 import MatrixClientPeg from '../../MatrixClientPeg';
 import sdk from '../../index';
 import { sanitizedHtmlNode } from '../../HtmlUtils';