Guide for maintainers of Jakarta Validation Specification

This guide is intended for maintainers of Jakarta Validation, i.e. anybody with direct push access to the git repository.

Preparing for the next iteration

When preparing the repository for the next major/minor version:

Update the project version (if not already done by the release) using the following maven command
```
mvn versions:set -DgenerateBackupPoms=false -DnewVersion=$NEW_VERSION
```
Update the versions in the following files:
- xml-descriptor.asciidoc
- tck-audit.xsl (including the version attribute in the specification tag)
Create a placeholder section for "What's new" in whatsnew.asciidoc
Generate a new tck-audit.xml (see README.md) and push it to the Jakarta Validation TCK repository.