Fix class declaration according to consistency. (#235)

telegram/ext/dispatcher.py

@@ -79,7 +79,7 @@ def run_async(func):
     return async_func
 
 
-class Dispatcher:
+class Dispatcher(object):
     """
     This class dispatches all kinds of updates to its registered handlers.
     A handler is a function that usually takes the following parameters

telegram/ext/updater.py

@@ -37,7 +37,7 @@ from telegram.utils.webhookhandler import (WebhookServer, WebhookHandler)
 logging.getLogger(__name__).addHandler(NullHandler())
 
 
-class Updater:
+class Updater(object):
     """
     This class, which employs the Dispatcher class, provides a frontend to
     telegram.Bot to the programmer, so they can focus on coding the bot. Its

tests/test_updater.py

@@ -632,7 +632,7 @@ class UpdaterTest(BaseTest, unittest.TestCase):
         self.assertRaises(ValueError, Updater)
 
 
-class MockBot:
+class MockBot(object):
 
     def __init__(self, text, messages=1, raise_error=False,
                  bootstrap_retries=None, bootstrap_err=TelegramError('test')):