Fix the name of the colors attribute on Custom Snow

Author: maddie480

Ahorn/effects/customSnow.jl

@@ -2,7 +2,7 @@ module SpringCollab2020CustomSnow
 
 using ..Ahorn, Maple
 
-@mapdef Effect "SpringCollab2020/CustomSnow" CustomSnow(only::String="*", exclude::String="", color::String="FFFFFF,FFFFFF")
+@mapdef Effect "SpringCollab2020/CustomSnow" CustomSnow(only::String="*", exclude::String="", colors::String="FFFFFF,FFFFFF")
 
 placements = CustomSnow