Update CHANGELOG

Author: bouwew

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Ongoing
+
+- Add Add missing Emma firmware via PR [#863](https://github.com/plugwise/python-plugwise/pull/863)
+- Improve test function added in #860 via PR [#862](https://github.com/plugwise/python-plugwise/pull/862)
+
 ## v1.11.3
 
 - Improve handling of missing thermostat data via PR [#860](https://github.com/plugwise/python-plugwise/pull/860)