message: run autocomplete after mounting
  componentWillReceiveProps doesn't run after mount,
  and is deprecated as well.
  Update state after both on componentDidMount and componentDidUpdate
diff: @@ -60,18 +60,22 @@ export default class Autocomplete extends React.Component {
  };
  }
  - componentWillReceiveProps(newProps, state) {
  - if (this.props.room.roomId !== newProps.room.roomId) {
  + componentDidMount() {
  + this._applyNewProps();
  + }
  +
  + _applyNewProps(oldQuery, oldRoom) {
  + if (oldRoom && this.props.room.roomId !== oldRoom.roomId) {
  this.autocompleter.destroy();
  - this.autocompleter = new Autocompleter(newProps.room);
  + this.autocompleter = new Autocompleter(this.props.room);
  }
  // Query hasn't changed so don't try to complete it
  - if (newProps.query === this.props.query) {
  + if (oldQuery === this.props.query) {
  return;
  }
  - this.complete(newProps.query, newProps.selection);
  + this.complete(this.props.query, this.props.selection);
  }
  componentWillUnmount() {
  @@ -233,7 +237,8 @@ export default class Autocomplete extends React.Component {
  }
  }
  - componentDidUpdate() {
  + componentDidUpdate(prevProps) {
  + this._applyNewProps(prevProps.query, prevProps.room);
  // this is the selected completion, so scroll it into view if needed
  const selectedCompletion = this.refs[`completion${this.state.selectionOffset}`];
  if (selectedCompletion && this.container) {
  