BETA 0.4.4 - Fix SpigotImplementation runAtEntityTimer() & runAtEntityLater() & other minor cleanups

What's Changed

• Change JavaPlugin to Plugin by @failutee in #26
• Fix SpigotImplementation runAtEntityTimer() & runAtEntityLater() & minor cleanups by @TechnicallyCoded in #36

New Contributors

• @failutee made their first contribution in #26

Full Changelog: 0.4.3...0.4.4