Changelog fix for the davclient.principals method

#516

Author: tobixen

CHANGELOG.md

@@ -24,7 +24,7 @@ This project should adhere to [Semantic Versioning](https://semver.org/spec/v2.0
   * Improved tests (but no test for inheritance yet).
   * Documentation, linked up from the reference section of the doc.
   * It's allowable with a yaml config file, but the yaml module is not included in the dependencies yet ... so late imports as for now, and the import is wrapped in a try/except-block
-* New method `davclient.principals()` will return all principals on server - if server permits.
+* New method `davclient.principals()` will return all principals on server - if server permits.  It can also do server-side search for a principal with a given user name - if server permits
 
 ### Documentation and examples