remove unicode_iteral import to support python2

pyNfsClient/__info__.py

 __title__ = "pyNfsClient"
 __description__ = "Pure python NFS client"
-__version__ = "0.1.1"
+__version__ = "0.1.2"
 __license__ = "MIT"
 __url__ = "https://github.com/CharmingYang0/NfsClient"
 __author__ = "Cooper Yang"

pyNfsClient/__init__.py

-from __future__ import absolute_import, unicode_literals
+from __future__ import absolute_import
 import logging
 from logging import NullHandler
 from .__info__ import (__version__, __author__, __author_email__, __description__)