Removing unneeded from __future__ import statements.

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

ebook_converter/utils/wordcount.py

@@ -1,8 +1,3 @@
-#!/usr/bin/python2
-# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 """
 Get word, character, and Asian character counts