Add simple python3 compatibility fix

Author: mexicarne

setup.py

@@ -22,7 +22,11 @@
     install_reqs += ['argparse']
     tests_reqs += ['unittest2']
 
-readme = open('README.rst').read()
+if sys.version_info[0] == 3:
+    readme = open('README.rst', encoding='utf-8').read()
+else:
+    readme = open('README.rst').read()
+
 history = open('CHANGES').read().replace('.. :changelog:', '')
 
 setup(