Added long_description_content_type

Author: Chilipp

setup.py

@@ -14,6 +14,7 @@ def readme():
       version='0.1.9',
       description='Extended sphinx autodoc including automatic autosummaries',
       long_description=readme(),
+      long_description_content_type='text/x-rst',
       classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',