Fix dependencies for standalone

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Core/src/plugin.yml

@@ -4,7 +4,10 @@ authors:
 - Yaruma3341
 - Lixfel
 main: de.steamwar.fightsystem.FightSystem
-depend: [SpigotCore, WorldEdit]
+softdepend:
+  - SpigotCore
+depend:
+  - WorldEdit
 api-version: "1.13"
 
 commands: