fix the fix...

Author: thijsdezoete

setup.py

@@ -17,7 +17,7 @@
 if sys.version_info.major > 2:
     tests_require.append("mypy")
 
-with io.open("PYPI.md", encoding="utf-8") as f:
+with io.open("pypi.md", encoding="utf-8") as f:
     long_description = f.read()