build: 插件以 1.19.4 为API

hamster-spawn/src/main/java/cn/hamster3/mc/plugin/spawn/SpawnPlugin.java

@@ -11,6 +11,7 @@ import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerRespawnEvent;
 import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
 
 public class SpawnPlugin extends JavaPlugin implements Listener {
     private Location spawnLocation;
@@ -24,7 +25,7 @@ public class SpawnPlugin extends JavaPlugin implements Listener {
     }
 
     @Override
-    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
         if (!sender.hasPermission("hamster.spawn.admin")) {
             sender.sendMessage("§c你没有这个权限！");
             return true;