message: Add prop type
diff: @@ -15,6 +15,7 @@ limitations under the License.
  */
  import React from 'react';
  +import { MatrixClient } from 'matrix-js-sdk';
  import sdk from '../../../index';
  import { _t } from '../../../languageHandler';
  import classnames from 'classnames';
  @@ -35,6 +36,8 @@ export default React.createClass({
  member: React.PropTypes.object,
  // group member object. Supply either this or 'member'
  groupMember: GroupMemberType,
  + // needed if a group member is specified
  + matrixClient: React.PropTypes.instanceOf(MatrixClient),
  action: React.PropTypes.string.isRequired, // eg. 'Ban'
  title: React.PropTypes.string.isRequired, // eg. 'Ban this user?'
  