Update Changelog

Author: bouwew

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+# v0.21.0: Smile: improve output, fix cooling-bug
+- Add `domestic_hot_water_setpoint` to the output. Will become an additional Number in Plugwise(-beta).
+- Create separate dicts for `domestic_hot_water_setpoint`, `maximum_boiler_temperature`, and `thermostat` in the output.
+- Change `set_max_boiler_temperature()` to `set_number_setpoint()` and make it more general so that more than one Number setpoint can be changed.
+- Fix a cooling-related bug (Anna + Elga).
+- Improve `set_temperature()`function.
+- Update the testcode accordingly.
+
 # v0.20.1: Smile: fix/improve cooling support (Elga/Loria/Thermastage) based on input from Plugwise
 
 # v0.20.0: Adam: add support for the Aqara Plug