register player parameter on older versions

Author: Revxrsal

bukkit/src/main/java/revxrsal/commands/bukkit/core/BukkitHandler.java

@@ -114,6 +114,8 @@ public BukkitHandler(@NotNull Plugin plugin) {
         if (EntitySelectorResolver.INSTANCE.supportsComplexSelectors() && isBrigadierSupported())
             getAutoCompleter().registerParameterSuggestions(EntityType.class, SuggestionProvider.EMPTY);
         registerValueResolverFactory(EntitySelectorResolver.INSTANCE);
+        if (!isBrigadierSupported())
+            getAutoCompleter().registerParameterSuggestions(Player.class, playerSuggestionProvider);
         getAutoCompleter().registerSuggestion("players", playerSuggestionProvider);
         getAutoCompleter()
                 .registerSuggestion("worlds", SuggestionProvider.map(Bukkit::getWorlds, World::getName))