anchor.diff:    /// Sends a message to `channel`
     ///
     ///    sendmessage("channelid", "My message!");
  -  sendMessage(String channel, String content) async {
  +  Future sendMessage(String channel, String content) async {
       var r = await this._api.post('channels/$channel/messages', {"content": content});
       Map res = JSON.decode(r.body);
   
  
positive.code:     "message": []
    };
  
    _heartbeat() {
      return JSON.encode({"op": 1,"d": this._lastS});
    }
  
    _handleMsg(msg) {
      //print('Message received: $msg');
      var json = JSON.decode(msg);
  
  
negative.code:     });
    }
  
    int onEvent(String event, function) {
      if (this._handlers.keys.contains(event.toLowerCase())) {
        this._handlers[event].add(function);
        return this._handlers[event].indexOf(function);
  