Releasing graphql-metrics

1. Check the Semantic Versioning page for info on how to version the new release: http://semver.org
2. Update VERSION in lib/graphql/metrics/version.rb
3. Add a CHANGELOG entry for the new release
4. Commit the changes with a commit message like "Packaging for release X.Y.Z"
5. Tag the release with the version (Leave REV blank for HEAD or provide a SHA)
  $ git tag vX.Y.Z REV
6. Push out the changes
  $ git push
7. Push out the tags
  $ git push --tags
8. Publish the gem
  $ gem build graphql_metrics.gemspec
  $ gem push graphql-metrics-X.Y.Z.gem