Enable logic to fail the release if SemVer is broken

[ctrueden]

The revapi-maven-plugin lets us programmatically test for API regressions (which should be SemVer major version bumps). Likely it can also flag API additions (which should be SemVer minor version bumps). We could hook this up to the release-version.sh script, such that whatever version bump is happening since last release is consistent with the reality of the API.