[x] The master branch should contain the latest "stable" version. Make sure all verified pull requests are merged.
[x] Make sure it builds properly running mvn clean install site -Pintegration-tests,docker.
[x] Test locally the master branch with the reference implementation, if there is one. If there is none, any other implementation can also be used for a local test.
If it is OK, continue, if not create or update an issue, in the issue tracker of that test.
[x] Review closed issues to be included in the release.
Update title if appropriate.
Tag, if they are not tagged with the milestone number.
[x] Update release notes, usually the file is at src/site/asciidoc/changelog.adoc.
Add a new title for the revision, if there is not one already.
Copy the issues to be included in the release, link and title.
Do the release. Process involves creating a revision based on the pom.xml version, updating the GitHub page, tag, and updating the revision on the pom for the next release.
https://github.com/opengeospatial/ets-wfs20/milestone/20