Bump bstats-bukkit from 2.1.0 to 2.2.1
Bump bstats-bukkit from 2.1.0 to 2.2.1

Bumps [bstats-bukkit](https://github.com/Bastian/bStats-Metrics) from 2.1.0 to 2.2.1.
- [Release notes](https://github.com/Bastian/bStats-Metrics/releases)
- [Commits](https://github.com/Bastian/bStats-Metrics/compare/v2.1.0...v2.2.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Codeski/dynmap-structures,KovuTheHusky/dynmap-structures