Removing unneeded from __future__ import statements.

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

ebook_converter/tinycss/tests/tokenizing.py

@@ -1,13 +1,10 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+from tinycss.tests import BaseTest, jsonify
+from tinycss.tokenizer import python_tokenize_flat, c_tokenize_flat, regroup
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
 
-from tinycss.tests import BaseTest, jsonify
-from tinycss.tokenizer import python_tokenize_flat, c_tokenize_flat, regroup
-
 if c_tokenize_flat is None:
     tokenizers = (python_tokenize_flat,)
 else: