fix mkdir

synergine2_cocos2d/util.py

     :param clear_dir: Remove content of given dir
     """
     path_ = Path(dir_path)
-    path_.mkdir(parents=True)
+    path_.mkdir(parents=False, exist_ok=True)
     if clear_dir:
         shutil.rmtree(dir_path)
-        path_.mkdir(parents=True)
+        path_.mkdir(parents=False, exist_ok=True)