Release checklist

• Make sure that the CHANGELOG.md covers all significant changes since the last release.
• Make sure that the VERSION file reflects the version you actually want to release.
• Check that the build is green in Travis CI.
• Run the tests locally to ensure they're green there, too.
• Run gem build prawn-table.gemspec
• Run gem push prawn-table-x-y-z.gem
• Run git tag x.y.z
• Run git push --tags
• Find the release on github and paste the relevant portions of the CHANGELOG there.
• Email the Prawn mailing list with an announcement about the release.