Update changelog.txt

Author: Bumber64

docs/changelog.txt

@@ -54,14 +54,17 @@ Template for new versions:
 ## New Tools
 
 ## New Features
+- `cleaners`: positional options to limit cleaning to a cuboid area. Options to remove grass or skip blood spatter removal.
 
 ## Fixes
+``tile-material.lua``: made root tiles return tree material when not using GetLayerMat.
 
 ## Misc Improvements
 
 ## Documentation
 
 ## API
+``Maps::isPlantInBox``: function to determine if a tree's tile is present in a cuboid.
 
 ## Lua