Add back Changelog (#11)

* Add back Changelog

* Handle review comments

Author: martinRenou

CHANGELOG.md

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+# Changelog
+
+<!-- <START NEW CHANGELOG ENTRY> -->
+<!-- <END NEW CHANGELOG ENTRY> -->
+
+## v0.2.0
+
+### What's Changed
+* Add docs by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/4
+* Fix build by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/5
+* Add Matplotlib to the env by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/7
+* Do not use xeus-python's master branch by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/8
+* Simplify dockerfile by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/9
+* Xeus python build addon by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/10
+
+
+**Full Changelog**: https://github.com/jupyterlite/xeus-python-kernel/compare/0.1.0...0.2.0
+
+## v0.1.0
+
+### Contributions
+* Initial version by @DerThorsten in https://github.com/jupyterlite/xeus-python-kernel/commit/d28dbc1ec9c1dca3f861d79ee5930054c00d5998
+* Remove sleep + renames according to https://github.com/jupyter-xeus/xeus-python/pull/530 by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/1
+* Fix README by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/2
+* Add Docker build by @martinRenou in https://github.com/jupyterlite/xeus-python-kernel/pull/3
+
+### Contributors
+* @DerThorsten started the project
+* @martinRenou made their first contribution in https://github.com/jupyterlite/xeus-python-kernel/pull/1
+
+**Full Changelog**: https://github.com/jupyterlite/xeus-python-kernel/commits/0.1.0