Tell PYPI our readme is markdown

see: https://dustingram.com/articles/2018/03/16/markdown-descriptions-on-pypi/

setup.py

@@ -20,6 +20,7 @@
     version=version,
     description="""Django-esteid is a package that provides Esteid based authentication for your Django applications.""",
     long_description=readme,
+    long_description_content_type='text/markdown',
     author='Thorgate',
     author_email='[email protected]',
     url='https://github.com/thorgate/django-esteid',