We now do this automatically in CI.

• Revise CHANGES.md, plugin-gradle/CHANGES.md, and plugin-maven/CHANGES.md
• If necessary, release lib ./gradlew :changelogPush
• Release the plugins one at a time ./gradlew :plugin-XXX:changelogPush
• Test latest spotless on:
  • Gradle via Apache beam at v2.13.0: https://github.com/apache/beam
    • bump the spotless version in buildSrc/build.gradle
    • ./gradlew spotlessApply -PdisableSpotlessCheck=true
  • Maven via JUNG at bf7e5b9: https://github.com/jrtom/jung
    • bump the spotless version in pom.xml
    • mvn spotless:apply -U
    • might take a while for mavencentral to update, the -U flag above ensures that it tries again rather than caching a failure
• Comment on all released PRs / issues