Removing unneeded from __future__ import statements.

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

ebook_converter/ebooks/conversion/plugins/htmlz_output.py

@@ -1,11 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-
-__license__ = 'GPL 3'
-__copyright__ = '2011, John Schember <john@nachtimwald.com>'
-__docformat__ = 'restructuredtext en'
-
 import io
 import os
 
@@ -15,6 +7,11 @@ from ebook_converter.ptempfile import TemporaryDirectory
 from ebook_converter.polyglot.builtins import unicode_type
 
 
+__license__ = 'GPL 3'
+__copyright__ = '2011, John Schember <john@nachtimwald.com>'
+__docformat__ = 'restructuredtext en'
+
+
 class HTMLZOutput(OutputFormatPlugin):
 
     name = 'HTMLZ Output'