Removing unneeded from __future__ import statements.

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

ebook_converter/ebooks/metadata/xmp.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__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
-
 import re, sys, copy, json
 from itertools import repeat
 from collections import defaultdict
@@ -21,6 +14,10 @@ from ebook_converter.utils.date import parse_date, isoformat, now
 from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639_1
 from ebook_converter.polyglot.builtins import iteritems, string_or_bytes, filter
 
+
+__license__ = 'GPL v3'
+__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
+
 _xml_declaration = re.compile(r'<\?xml[^<>]+encoding\s*=\s*[\'"](.*?)[\'"][^<>]*>', re.IGNORECASE)
 
 NS_MAP = {