Add correct default permissions for '/challenges' and '/challengesadmin' commands.

src/main/java/world/bentobox/challenges/ChallengesAddon.java

@@ -70,7 +70,7 @@ public class ChallengesAddon extends Addon {
     /**
      * Permission prefix for addon.
      */
-    private static final String PERMISSION_PREFIX = "addon";
+    private static final String PERMISSION_PREFIX = "addon.";
 
 	/**
 	 * This flag allows to complete challenges in any part of the world. It will not limit

src/main/resources/addon.yml

@@ -10,7 +10,13 @@ authors:
 
 softdepend: AcidIsland, BSkyBlock, CaveBlock, SkyGrid, Level
 
-permissions:    
+permissions:
+  addon.admin.challenges:
+    description: Access to '/challengesadmin' command
+    default: op
+  addon.challenges:
+    description: Let the player use the '/challenges' command
+    default: true
   bskyblock.challenges:
     description: Let the player use the '/island challenges' command
     default: true