Removing unneeded from __future__ import statements.

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

ebook_converter/polyglot/binary.py

@@ -1,9 +1,3 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-# License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 from base64 import standard_b64decode, standard_b64encode
 from binascii import hexlify, unhexlify
 

ebook_converter/polyglot/builtins.py

@@ -1,12 +1,7 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 import os
 import sys
 
+
 is_py3 = sys.version_info.major >= 3
 native_string_type = str
 iterkeys = iter

ebook_converter/polyglot/functools.py

@@ -1,13 +1,8 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-# License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 from ebook_converter.polyglot.builtins import is_py3
 if is_py3:
     from functools import lru_cache
 else:
     from backports.functools_lru_cache import lru_cache
 
+
 lru_cache

ebook_converter/polyglot/urllib.py

@@ -1,11 +1,6 @@
-#!/usr/bin/env python2
-# vim:fileencoding=utf-8
-# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
-
-from __future__ import absolute_import
-
 from ebook_converter.polyglot.builtins import is_py3
 
+
 if is_py3:
     from urllib.request import (build_opener, getproxies, install_opener,  # noqa
             HTTPBasicAuthHandler, HTTPCookieProcessor, HTTPDigestAuthHandler,  # noqa