README is in GitHub markdown instead of the default ReST that setup.c…

…fg expects

setup.cfg

@@ -4,6 +4,7 @@ version = attr: ham.__version__
 url = https://github.com/alexbarcelo/hass-mqtt-things
 description = Library for rapid development of things to be integrated with Home Assistant through MQTT
 long_description = file: README.md
+long_description_content_type = text/markdown
 keywords = home-assistant, things, home automation, iot, internet of things
 license = Apache Software License
 classifiers =