Fix issue with GreenThumb command display.

src/main/java/com/gmail/nossr50/skills/herbalism/HerbalismCommand.java

@@ -40,7 +40,7 @@ public class HerbalismCommand extends SkillCommand {
         farmersDietRank = calculateRank(Herbalism.farmersDietMaxLevel, Herbalism.farmersDietRankLevel1);
 
         //GREEN THUMB
-        greenThumbStage = calculateRank(Herbalism.greenThumbStageMaxLevel, Herbalism.greenThumbStageMaxLevel);
+        greenThumbStage = calculateRank(Herbalism.greenThumbStageMaxLevel, Herbalism.greenThumbStageChangeLevel);
 
         String[] greenThumbStrings = calculateAbilityDisplayValues(Herbalism.greenThumbMaxLevel, Herbalism.greenThumbMaxChance);
         greenThumbChance = greenThumbStrings[0];