HaloDB Revived

[darkfrog26]

I've been using HaloDB for a while in my projects, and its performance is still better than that of projects like RocksDB. I got sick of requiring the jitpack dependency and wanted to provide a place where new code could be added, so I created this: https://github.com/outr/HaloDB

Feel free to submit PRs. There's already a new release to Maven Central for anyone interested.