Additions:
- Added more notes to the config.yml to explain things a bit better.

Changes:
- Completed removed all deprecated methods in the 1.13 version.
- Fixed a bug where acidic mobs would not despawn.
- Fixed a bug where acidic mobs wouldn't spawn at all.
- Fixed a bug where Acid Rain would either constantly start or not start at all. (finally found the cause)
- Fixed a bug where Gamma Ray Bursts would either constantly start or not start at all. (same as above)
- Cleaned up some of the project code.

Notes: I'm thinking about either removing the custom mobs entirely or re-working them a bit differently to have a chance to spawn during storms instead of replacing all mobs. I think having it as a chance would be better for the general population. I could also set it as a chance so you could have a % of the mobs be acidic which would also allow for all acidic or a small percentage to be acidic.

I'll also be adding a feature where you can allow players to toggle the effects of the weather, for example if some of your players want a more hardcore experience they can have that but others can have it disabled too.