Update CHANGELOG.md

Author: sverhoeven

CHANGELOG.md

@@ -2,6 +2,35 @@
 
 ## Unreleased
 
+## 0.4.0
+
+### Added
+
+* Instructions to add your existing code to directory generated by the NLeSC Python template [#202](https://github.com/NLeSC/python-template/issues/202)
+* Keywords to questionaire [#270](https://github.com/NLeSC/python-template/issues/270)
+* Next step issue generation workflow [#228](https://github.com/NLeSC/python-template/issues/228)
+* Next step issue for SonarCloud integration [#234](https://github.com/NLeSC/python-template/issues/234) 
+* Next step issue for Zenodo integration [#235](https://github.com/NLeSC/python-template/issues/235)
+* Next step issue for Read the Docs [#236](https://github.com/NLeSC/python-template/issues/236)
+* Next step issue for citation data [#237](https://github.com/NLeSC/python-template/issues/237)
+* Next step issue for linting [#238](https://github.com/NLeSC/python-template/issues/238)
+* Next steps documentation [#240](https://github.com/NLeSC/python-template/issues/240)
+* Support for sub packages in distro [#160](https://github.com/NLeSC/python-template/issues/160)
+* Tests for api doc generation [#213](https://github.com/NLeSC/python-template/issues/213)
+* CI Tests on Windows [#140](https://github.com/NLeSC/python-template/issues/140) [#223](https://github.com/NLeSC/python-template/issues/223)
+* `.pylintrc` file
+* Valid license name and first author name in `CITATION.cff`
+* SonarCloud integration for code quality and coverage [#89](https://github.com/NLeSC/python-template/issues/89) 
+* Read the Docs [#78](https://github.com/NLeSC/python-template/issues/78)
+
+### Changed
+
+* Always generate API docs [#176](https://github.com/NLeSC/python-template/issues/176)
+* Have 100% test coverage in generated code [#88](https://github.com/NLeSC/python-template/issues/88)
+
+### Removed
+
+* Automatic publish to PyPi after GitHub release [#196](https://github.com/NLeSC/python-template/issues/196)
 
 ## 0.3.0