Remember to import React

Author: lukebarnard1

src/components/views/elements/GroupsButton.js

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import React from 'react';
 import sdk from '../../../index';
 import PropTypes from 'prop-types';
 import { _t } from '../../../languageHandler';