Force README encoding in setup.py

setup.py

@@ -2,16 +2,17 @@
 # Copyright © 2015-2017 ACSONE SA/NV
 # License LGPLv3 (http://www.gnu.org/licenses/lgpl-3.0-standalone.html)
 
+import io
 import os
 
 import setuptools
 
 here = os.path.abspath(os.path.dirname(__file__))
 
 long_description = []
-with open(os.path.join("README.rst")) as f:
+with io.open(os.path.join("README.rst"), encoding="utf-8") as f:
     long_description.append(f.read())
-with open(os.path.join("CHANGES.rst")) as f:
+with io.open(os.path.join("CHANGES.rst"), encoding="utf-8") as f:
     long_description.append(f.read())