Updating changelog.txt

Changelog.txt

@@ -8,6 +8,7 @@ Key:
   - Removal
 
 Version 2.0.1
+ ! Skill Super Powers (Tree Feller, etc...) will now require level 10+ to use
  ! mcMMO skills will now be on a scale from 1-100 instead of 0-1000 (I'll be explaining this in a write-up)
  ! Refactored some unreadable code relating to SecondaryAbility activation in SkillUtils