message: room stub not having getVersion method broke tests
diff: @@ -255,6 +255,7 @@ export function mkStubRoom(roomId = null) {
  getUnfilteredTimelineSet: () => null,
  getAccountData: () => null,
  hasMembershipState: () => null,
  + getVersion: () => '1',
  currentState: {
  getStateEvents: sinon.stub(),
  mayClientSendStateEvent: sinon.stub().returns(true),
  