anchor.diff:      /**
   	 * Creates an [Message] object which can be sent to a Slack channel
   	 **/
  -	Message(this.text, {this.username,this.icon_emoji,this.icon_url,this.attachments});
  +	Message(this.text, {this.username,this.channel,this.icon_emoji,this.icon_url,this.attachments});
     
   	/**
   	 * Prints out the [Map] that this object represents
  
positive.code: 		
  		if (username != null)
  			message['username'] = username;
  		
  		if (icon_url != null)
  			message['icon_url'] = icon_url;
  
negative.code: 	String username;
  	
  	/**
  	 * This is the channel the message will be sent to. By default the channel will be #general. Channel name must start with #.
       **/
      String channel = '#general';
      
  	/**
  	 * By default, the message will show an icon that looks like the webhooks icon. You can change this by setting [icon_url] or [icon_emoji]
  	 **/
  	String icon_url;
  