Added new permission node to control who can check version number

Negate this permission node to hide the version number from /mcmmo and
motd

src/main/resources/plugin.yml

@@ -1937,6 +1937,9 @@ permissions:
         children:
             mcmmo.ability.woodcutting.all: true
             mcmmo.commands.woodcutting: true
+    mcmmo.showversion:
+        default: true
+        description: Show mcMMO version number in /mcmmo and motd
     mcmmo.tools.*:
         default: false
         description: Implies all mcmmo.tools permissions.