Adding mushroom stems to Tree Feller

Changelog.txt

@@ -8,6 +8,7 @@ Key:
   - Removal
 
 Version 2.1.2
+    (Skills) Tree Feller now works on Mushroom Stems
     (Experience) Wood blocks now give XP and are affected by Tree Feller (6 sided bark blocks)
     (API) Moved XPGainReason from skills to experience package
     (API) Added XpGainSource for tracking sources of XP

src/main/resources/experience.yml

@@ -256,6 +256,7 @@ Experience:
         Mycelium: 70
         Red_Mushroom_Block: 70
         Brown_Mushroom_Block: 70
+        Mushroom_Stem: 80
     Herbalism:
         Tube_Coral_Fan: 80
         Brain_Coral: 90