Derpy's Kat Pack

The "Cleanup" update

- Actually removed Mekanism instead of just the addons

- Removed Create Automated addon because good lord the balancing is awful.

I'm going to be testing every mod before it makes it into the modpack from now on, so expect less of these "removed an old mod because the balancing was bad" changes.

Also, we've ditched the placeholder thumbnail in favor of an in-game screenshot, and ditched the placeholder name for the first memorable-sounding thing that popped into my head. Progress!