Update CHANGELOG.rst

CHANGELOG.rst

@@ -2,6 +2,12 @@ A note on versioning: This librarys major version will grow with the APIs
 version number. Breaking changes will be indicated by a change in the minor
 (or major) version number, and will generally be avoided.  
 
+v2.1.0 (IN PROGRESS)
+--------------------
+* Fixed to_json breaking on python 3.14 (Thanks @limburgher for the report)
+* Replaced pytest-vcr (deprecated) with pytest-recording (Thanks @CyberTailor)
+* Improved timeline documentation (Thanks @adamse)
+
 v2.0.1
 ------
 Maintenance release. Fixes a few minor, but important, issues