update BungeeCord injector

[Outfluencer]

closes #544

[Outfluencer]

Fixes incompatibility with SpigotMC/BungeeCord#3737

[Camotoy]

Will this version work on older Bungee versions without the recent changes?

If not, would you be able to still check for the old field and throw an exception telling people to update? If you don't want to do that, that's fine; we can take care of it.

[Tim203]

I've verified that this works, ty!
If you're able to re-add the code that works for older Bungee versions in the next few hours, feel free to do so.
Otherwise I'm also more than happy to re-add it and get it out of the door.

[Outfluencer]

I can do