updated README.md

README.md

@@ -74,7 +74,7 @@ a shortcut for test dataset
 ```python
 from csst_common.data_manager import CsstMbiDataManager
 
-CsstMbiDataManager.quickstart(hostname="dandelion", ver_sim="C5.2", dir_l1=".", exposure_id=100)
+CsstMbiDataManager.quickstart(ver_sim="C5.2", dir_l1=".", exposure_id=100)
 ```
 
 ## algorithm description