Removing unneeded from __future__ import statements.

Since we are on Python 3.6 and up, we don't need those anymore.

ebook_converter/devices/interface.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__   = 'GPL v3'
-__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 import os
 from collections import namedtuple
 
@@ -10,6 +6,10 @@ from ebook_converter.constants import iswindows
 from ebook_converter.customize import Plugin
 
 
+__license__   = 'GPL v3'
+__copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
+
+
 class DevicePlugin(Plugin):
     """
     Defines the interface that should be implemented by backends that