Fix for build

Author: Li Xu

setup.py

@@ -23,7 +23,7 @@ def read(*filenames, **kwargs):
             buf.append(f.read())
     return sep.join(buf)
 
-long_description = read('README.txt', 'CHANGES.txt')
+long_description = read('README.md', 'CHANGES.txt')
 
 setup(name=NAME,
       author=AUTHOR,