Log Message:
py-prometheus_client: updated to 0.20.0

0.20.0

[CHANGE/BUGFIX] Update OpenMetrics Content Type to 1.0.0.
[FEATURE] Enable graceful shutdown for start_{http,wsgi}_server by returning the \ 
server and thread.
[FEATURE] Allow resetting counter metrics.
[BUGFIX] wsgi server: address family discovery is not quite right.