Update all future imports for Python 2

plexpy/notification_handler.py

@@ -19,12 +19,10 @@
 from __future__ import division
 from __future__ import absolute_import
 from __future__ import unicode_literals
-from future import standard_library
-standard_library.install_aliases()
-from builtins import next
-from builtins import map
-from builtins import str
-from builtins import range
+from future.builtins import next
+from future.builtins import map
+from future.builtins import str
+from future.builtins import range
 from past.builtins import basestring
 from past.utils import old_div