Update changelog

Author: bouwew

CHANGELOG.md

@@ -1,7 +1,8 @@
 # Changelog
 
-# v0.16.2 - Generic:
+# v0.16.2 - Generic and Stretch
   - As per Core deprecation of python 3.8, removed CI/CD testing and bumped pypi to 3.9 and production
+  - Add support for Stretch with fw 2.7.18
 
 # v0.16.1 - Smile - various updates:
   - BREAKING: Change active device detection, detect both OpenTherm (replace Auxiliary) and OnOff (new) heating and cooling devices.