Removing unneeded from __future__ import statements.

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

ebook_converter/ebooks/docx/writer/lists.py

@@ -1,15 +1,12 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__ = 'GPL v3'
-__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
-
 from collections import defaultdict
 from operator import attrgetter
 
 from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 
+
+__license__ = 'GPL v3'
+__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
+
 LIST_STYLES = frozenset(
     'disc circle square decimal decimal-leading-zero lower-roman upper-roman'
     ' lower-greek lower-alpha lower-latin upper-alpha upper-latin hiragana hebrew'