更新 'README.md'

README.md

@@ -35,7 +35,7 @@ $ choppy apps
 # 准备 samples.csv 文件
 $ choppy samples chenqingwang/SplAdder-merge-latest > samples.csv
 # 准备无默认参数的samples.csv 文件
-choppy samples --no-default chenqingwang/SplAdder-merge-latest > samples.csv
+$ choppy samples --no-default chenqingwang/SplAdder-merge-latest > samples.csv
 
 # 提交任务
 $ choppy batch chenqingwang/SplAdder-merge-latest samples.json -p Your_project_name -l Your_label