Removing unneeded from __future__ import statements.

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

ebook_converter/ebooks/oeb/polish/css.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__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
-
 from collections import defaultdict
 from functools import partial
 
@@ -20,6 +13,10 @@ from ebook_converter.css_selectors import Select, SelectorError
 from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type, filter
 
 
+__license__ = 'GPL v3'
+__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
+
+
 def filter_used_rules(rules, log, select):
     for rule in rules:
         used = False