Update: README.md

README.md

 
 ```Shell
 # Activate the choppy environment
-$open-choppy-env
+$ open-choppy-env
 
 # Install the APP
-$choppy install YaqingLiu/variant-calling-latest [-f]
+$ choppy install YaqingLiu/variant-calling-latest [-f]
 
 # List the parameters
-$choppy samples YaqingLiu/variant-calling-latest [--no-default]
+$ choppy samples YaqingLiu/variant-calling-latest [--no-default]
 
 # Submit you task with the `samples.csv file` and `project name`
-$choppy batch YaqingLiu/variant-calling-latest samples.csv -p Project [-l project:Label]
+$ choppy batch YaqingLiu/variant-calling-latest samples.csv -p Project [-l project:Label]
 
 # Query the status of all tasks in the project
-$choppy query -L Label | grep "status"
+$ choppy query -L Label | grep "status"
 ```
 
 **Please note:** The `defaults` can be forcibly replaced by the settings in `samples.csv`. Therefore, there is no need to contact me over this issue.