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/pml_input.py

@@ -1,10 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
-__license__   = 'GPL v3'
-__copyright__ = '2009, John Schember <john@nachtimwald.com>'
-__docformat__ = 'restructuredtext en'
-
 import glob
 import os
 import shutil
@@ -14,6 +7,11 @@ from ebook_converter.ptempfile import TemporaryDirectory
 from ebook_converter.polyglot.builtins import getcwd
 
 
+__license__   = 'GPL v3'
+__copyright__ = '2009, John Schember <john@nachtimwald.com>'
+__docformat__ = 'restructuredtext en'
+
+
 class PMLInput(InputFormatPlugin):
 
     name        = 'PML Input'