Fix imports

missilewars-plugin/src/main/java/de/butzlabben/missilewars/player/PlayerData.java

@@ -30,8 +30,8 @@ import org.bukkit.inventory.ItemStack;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.UUID;