• mcMMO now requires Java 16
• mcMMO now requires the newest version of Minecraft (currently 1.17.1)
• Fixed several API breaks (mostly affected Alchemy)
• Fixed a bug relating to Shake percentages (thanks Lyther)
• Fixed hexcolors not displaying correctly in level up milestone broadcasts (thanks gecko10000)
• (API) Added deprecated constructors for PlayerProfile (thanks PikaMug)
• mcMMO has had many of its dependencies updated to newer builds

NOTES:
If you want to play mcMMO on older versions, simply use 2.1.202 instead
Keeping mcMMO backwards compatible with older versions is getting messy, and I'd rather be able to focus my attention at newer features than having to make an elaborate build process (or alternatively hacky code) to support older versions of the game
Furthermore, it seems most people are playing 1.17.1 by a wide margin
You may have trouble compiling the source code if your maven is not setup to run JDK16, if you get any errors when compiling this is likely the reason

The data from bstats went into making this decision (shoutout to Qixils for typing this up too)
71.9% of servers are running 1.17.X
97.9% of servers are running ≥1.16
99.3% of servers are running ≥1.15