add backward compatibility for python2

Author: altairbow

setup.py

@@ -1,3 +1,4 @@
+import codecs
 import shutil
 import setuptools
 
@@ -24,7 +25,7 @@ def setup():
         license='MIT',
         version=__version__,
         description=__description__,
-        long_description=open('README.md').read(),
+        long_description=codecs.open('README.md', encoding='UTF-8').read(),
         long_description_content_type='text/markdown',
         author=__author__,
         author_email=__author_email__,