Update CHANGELOG.md

Author: SmokingDevices

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [1.4.0] - unreleased
 
 ### Added
-* Added new fields to be compatible with Fritz!OS 7.25
+* [#18] Added new fields to be compatible with Fritz!OS 7.25
   * Device (Fritz!Dect440) serves now relative humidity
   * ColorControl (Fritz!Dect500) got some more fields
   * Added some getter for fields that did miss them