update README

README.md

@@ -15,8 +15,8 @@ $ choppy install YaqingLiu/ngscheckmate_fastq-latest [-f]
 # List the parameters
 $ choppy samples YaqingLiu/ngscheckmate_fastq-latest [--no-default]
 
-# Submit you task with the `samples.json file` and `project name`
-$ choppy batch YaqingLiu/ngscheckmate_fastq-latest samples.json -p Project [-l project:Label]
+# Submit you task with the `samples.csv file` and `project name`
+$ choppy batch YaqingLiu/ngscheckmate_fastq-latest samples.csv -p Project [-l project:Label]
 
 # Query the status of all tasks in the project
 $ choppy query -L project:Label | grep "status"