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/transforms/jacket.py

@@ -1,11 +1,3 @@
-#!/usr/bin/env python2
-# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__   = 'GPL v3'
-__copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
-__docformat__ = 'restructuredtext en'
-
 import sys, os, re
 from xml.sax.saxutils import escape
 from string import Formatter
@@ -20,6 +12,11 @@ from ebook_converter.ebooks.chardet import strip_encoding_declarations
 from ebook_converter.ebooks.metadata import fmt_sidx, rating_to_stars
 from ebook_converter.polyglot.builtins import unicode_type, map
 
+
+__license__   = 'GPL v3'
+__copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
 JACKET_XPATH = '//h:meta[@name="calibre-content" and @content="jacket"]'