remove -*- coding: ... lines, utf-8 is default for py3

docs/conf.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # documentation build configuration file, created by
 # sphinx-quickstart on Sat Sep 10 18:18:25 2011.
 #

setup.py

@@ -1,4 +1,3 @@
-# -*- encoding: utf-8 *-*
 import os
 import io
 import re

setup_docs.py

@@ -1,4 +1,3 @@
-# -*- encoding: utf-8 *-*
 # Support code for building docs (build_usage, build_man)
 
 import os