Automated Changelog Entry for 0.2.1 on 0.2.x (#60)

* Automated Changelog Entry for 0.2.1 on 0.2.x

* Update changelog

Co-authored-by: GitHub Action <41898282+github-actions[bot]@users.noreply.github.com>

Author: davidbrochart

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 0.2.1
+
+Back-port of #56, #57 and #59.
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 0.2.0
 
 ([Full Changelog](https://github.com/jupyter-server/jupyter_ydoc/compare/v0.1.17...55dc65afafb669d0a5552e485cf860d402740dc7))
@@ -17,8 +23,6 @@
 
 [@davidbrochart](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyter_ydoc+involves%3Adavidbrochart+updated%3A2022-08-01..2022-09-26&type=Issues) | [@hbcarlos](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyter_ydoc+involves%3Ahbcarlos+updated%3A2022-08-01..2022-09-26&type=Issues) | [@pre-commit-ci](https://github.com/search?q=repo%3Ajupyter-server%2Fjupyter_ydoc+involves%3Apre-commit-ci+updated%3A2022-08-01..2022-09-26&type=Issues)
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 0.1.17
 
 ([Full Changelog](https://github.com/jupyter-server/jupyter_ydoc/compare/v0.1.16...106ee079e2ad9ed7c8b25693932ad921e3ea3e20))