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/utils.py

@@ -1,12 +1,9 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+from ebook_converter.tinycss.color3 import parse_color_string
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
-from ebook_converter.tinycss.color3 import parse_color_string
-
 
 def int_or_zero(raw):
     try: