Define long description format to Markdown

Author: stephane

setup.py

@@ -18,6 +18,7 @@ def get_long_description():
     version=__version__,
     description="Easy sorting of tables with Django",
     long_description=get_long_description(),
+    long_description_content_type="text/markdown",
     author="Stéphane Raimbault",
     author_email="[email protected]",
     url="http://github.com/webstack/webstack-django-sorting/",