Make Map final

src/de/steamwar/command/AbstractSWCommand.java

@@ -34,7 +34,7 @@ import java.util.stream.Collectors;
 
 public abstract class AbstractSWCommand<T> {
 
-    private static Map<Class<AbstractSWCommand<?>>, List<AbstractSWCommand<?>>> dependencyMap = new HashMap<>();
+    private static final Map<Class<AbstractSWCommand<?>>, List<AbstractSWCommand<?>>> dependencyMap = new HashMap<>();
 
     private Class<?> clazz; // This is used in createMappings()