Add command to plugin.yml for 1.13 compatibility

The long term plan should be to use brigadier, but for now this will suffice.

plugin.yml

@@ -8,6 +8,10 @@ authors: [Cayorion, Madus, Ulumulu1510, MarkehMe, Brettflan]
 depend: [MassiveCore]
 softdepend: [PermissionsEx, Permissions, Essentials, EssentialsChat, HeroChat, LocalAreaChat, LWC, ChatManager, AuthMe, Vault, WorldEdit, WorldGuard]
 api-version: 1.13
+commands:
+  f:
+    description: Hi
+    permission: factions.basecommand
 permissions:
 # -------------------------------------------- #
 # THE REAL NODES