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/to_html.py

@@ -1,10 +1,3 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__ = 'GPL v3'
-__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
-
 import sys, os, re, math, errno, uuid, numbers
 from collections import OrderedDict, defaultdict
 
@@ -31,6 +24,9 @@ from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639
 from ebook_converter.polyglot.builtins import iteritems, itervalues, filter, getcwd, map, unicode_type
 
 
+__license__ = 'GPL v3'
+__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
+
 NBSP = '\xa0'