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/links.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__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
-
 import posixpath, re
 from uuid import uuid4
 
@@ -13,6 +6,10 @@ from ebook_converter.polyglot.builtins import unicode_type
 from ebook_converter.polyglot.urllib import urlparse
 
 
+__license__ = 'GPL v3'
+__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
+
+
 def start_text(tag, prefix_len=0, top_level=True):
     ans = tag.text or ''
     limit = 50 - prefix_len