Python3 doesn't need to import print_function

This is now a standard feature and no longer needs to be imported from __future__.

https://www.python.org/dev/peps/pep-3105/

test/test_textencoding.py

@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import print_function
 import unittest
 from picard import util
 #from picard.util import textencoding