Improve localization

Plugin.php

@@ -55,7 +55,7 @@ class Plugin extends \Mibew\Plugin\AbstractPlugin implements \Mibew\Plugin\Plugi
         $client = new Client($this->config['slack_url'], $settings);
 
 
-        $client->send($this->config['message']);
+        $client->send(getlocal('You have a new user waiting for a response. Username: {0}', array($args['thread']->userName)));
 
 		return true;
     }

README.md

@@ -27,8 +27,6 @@ Provides Slack notifications when initiate a chat
             username: 	"Username you will post as"
             channel: 	"Channel to post in"
             slack_url: 	"Webhook URL from Setup Instructions in Slack"
-			message:	"You have a new visitor!"
-
     ```