add "isRepliedMessage" helper function

Author: ErfanBahramali

src/Helpers/Helper.php

@@ -187,6 +187,16 @@ public static function isForwarded()
         return isset(self::$updateContent['forward_date']);
     }
 
+    /** 
+     * isRepliedMessage fucntion
+     * 
+     * @return bool return true, if message is replied
+     */
+    public static function isRepliedMessage()
+    {
+        return isset(self::$updateContent['reply_to_message']);
+    }
+
     /** 
      * getId function
      *