Removing unneeded from __future__ import statements.

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

ebook_converter/ebooks/html/input.py

@@ -1,16 +1,6 @@
-#!/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'
-
-
-'''
+"""
 Input plugin for HTML or OPF ebooks.
-'''
-
+"""
 import os, re, sys,  errno as gerrno
 
 from ebook_converter.ebooks.oeb.base import urlunquote
@@ -21,6 +11,11 @@ from ebook_converter.polyglot.builtins import is_py3, unicode_type
 from ebook_converter.polyglot.urllib import urlparse, urlunparse
 
 
+__license__   = 'GPL v3'
+__copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+
 class Link(object):
 
     '''