This update can fix a few issues some serves have been having:

• Revert back to GSON for json things, it includes gson so that servers like 1.8 can have it.
• Minecraft packet errors will be handled as normal, preventing some exploits and errors being shown wrong.
• Correct an issue with bossbars causing concurrency issues.
• Add a new protocol version method to the API (Thanks Matsv!)

Updates may seem to be coming slow, but behind the scenes I've been working on recoding it so any developer can make a protocol hack.
You can see my progress here:
https://github.com/MylesIsCool/ViaVersion/tree/apiv2
(Which when we're happy will be pushed)

Otherwise find any new issues please report them on the GitHub issues section thanks!