--format csv does not work

I'm trying to integrate observatory-cli (installed from npm) into a script in order to retrieve a CSV file, but it's not giving CSV output, as shown below

<img width="970" alt="screen shot 2018-01-12 at 08 49 51" src="https://user-images.githubusercontent.com/770363/34864667-a829af3c-f775-11e7-864f-a353f2badcf1.png">
