drop Python 2-only logic

Only Python 3 is supported nowadays.

Author: vapier

check_versions.py

@@ -1,10 +1,7 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*- #
 
 """Make sure the installed versions all match what we need."""
 
-from __future__ import print_function
-
 import os
 import pkg_resources
 

pelicanconf.py

@@ -1,16 +1,14 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*- #
-from __future__ import unicode_literals
 
-AUTHOR = u'libgd.org'
-SITENAME = u'GD Graphics Library'
+AUTHOR = 'libgd.org'
+SITENAME = 'GD Graphics Library'
 SITEURL = ''
 
 PATH = 'content'
 
 TIMEZONE = 'Europe/Paris'
 
-DEFAULT_LANG = u'en'
+DEFAULT_LANG = 'en'
 
 # Blogroll
 LINKS =  (

publishconf.py

@@ -1,9 +1,9 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*- #
-from __future__ import unicode_literals
 
-# This file is only used if you use `make publish` or
-# explicitly specify it as your config file.
+"""
+This file is only used if you use `make publish` or explicitly specify it as
+your config file.
+"""
 
 import os
 import sys