Update dependencies

[TWSSYesterday]

Compiles with Spigot 1.8.7. Versions below have security flaws; don't see why you'd keep it compiled with that version in general too. Also updated Vault to 1.5

[graywolf336]

Thanks for this. The security flaws don't affect plugins unless the flaws are in the methods used by the plugins and even still the api methods used by this plugins shouldn't break with each of the updates made thus a recompile isn't directly necessary. But thanks for the Pull Request. :smile:

[TWSSYesterday]

I know, but there's no point holding onto a server jar that people shouldn't be using :P Only encourages it haha