message: Avoid doubling up username in read receipt view
  In the ReadReceiptMarker title, use the RoomMember.rawDisplayName because
  RoomMember.name may already include the username, which we are going to add
  ourselves.
diff: @@ -187,7 +187,7 @@ module.exports = React.createClass({
  if (this.props.timestamp) {
  title = _t(
  "Seen by %(displayName)s (%(userName)s) at %(dateTime)s",
  - {displayName: this.props.member.name,
  + {displayName: this.props.member.rawDisplayName,
  userName: this.props.member.userId,
  dateTime: formatDate(new Date(this.props.timestamp), this.props.showTwelveHour)},
  );
  