Merge pull request #693 from Labelbox/contrib-update

Update CONTRIB.md

Author: msokoloff1

CONTRIB.md

@@ -39,8 +39,7 @@ variable. For more info see [Labelbox API key docs](https://labelbox.helpdocs.io
 To pass tests, code must be formatted using the following command:
 
 ```shell
-yapf tests/* -i --verbose --recursive --parallel --style "google"
-yapf labelbox/* -i --verbose --recursive --parallel --style "google"
+yapf tests labelbox -i --verbose --recursive --parallel --style "google"
 ```
 
 ## Release Steps