Make logger fully configurable (#1087)

telethon/__init__.py

@@ -1,12 +1,9 @@
-import logging
 from .client.telegramclient import TelegramClient
 from .network import connection
 from .tl import types, functions, custom
 from . import version, events, utils, errors
 
-
 __version__ = version.__version__
-logging.getLogger(__name__).addHandler(logging.NullHandler())
 
 __all__ = ['TelegramClient', 'types', 'functions', 'custom',
            'events', 'utils', 'errors']