Fixing Double Drops for Mining -- READ THE FULL COMMIT MSG

This fix is very similar to what was deployed for Herbalism in 2.1.22

NOTE: Here's what your Double_Drop entries in Config.yml for Mining should look like

https://paste.gg/p/anonymous/dcd06f1215844311b4f2225f200090d1

IMPORTANT: Version 2.1.22 which came before this had a similar fix for Herbalism, instructions on how to fix your Herbalism Double Drops can be found here
        https://www.spigotmc.org/resources/official-mcmmo.64348/update?update=269868

src/main/resources/config.yml

@@ -457,6 +457,9 @@ Double_Drops:
         Rose_Bush: true
         Peony: true
     Mining:
+        Andesite: true
+        Diorite: true
+        Granite: true
         Coal_Ore: true
         Diamond_Ore: true
         Emerald_Ore: true