changed cli parser to yargs

README.md

@@ -8,6 +8,20 @@ npm install -g k6-to-junit
 
 ## Usage
 
+the `k6-to-junit` command is created which reads input from the stdin and can output to either stdout or a file.
+
+### Output to stdout
+
+this allows you to pipe the xml outout to another program for further processing
+
+```shell
+k6 run script.js | k6-to-junit
+```
+
+### Output to file
+
+this passes through the stdin to the stdout
+
 ```shell
-k6 run script.js | k6-to-junit stdin --out junit.xml
+k6 run script.js | k6-to-junit junit.xml
 ```