Add User.bot attribute to check if a user is a bot account.

discord/user.py

@@ -54,15 +54,18 @@ class User:
         The user's discriminator. This is given when the username has conflicts.
     avatar : str
         The avatar hash the user has. Could be None.
+    bot : bool
+        Specifies if the user is a bot account.
     """
 
-    __slots__ = ['name', 'id', 'discriminator', 'avatar']
+    __slots__ = ['name', 'id', 'discriminator', 'avatar', 'bot']
 
     def __init__(self, **kwargs):
         self.name = kwargs.get('username')
         self.id = kwargs.get('id')
         self.discriminator = kwargs.get('discriminator')
         self.avatar = kwargs.get('avatar')
+        self.bot = kwargs.get('bot', False)
 
     def __str__(self):
         return '{0.name}#{0.discriminator}'.format(self)