Ignore zone option

[jsfez]

A user need to ignore an area for mobile testing. As Odiff has a build-in feature for it, it should not be hard to implement.

TO DO

• [ ] Add the option in the CLI
• [ ] Add a visual mark in Argos SaaS when a screenshot area is ignored
• [ ] Document the new option
• [ ] Reach out to the client when it's done

ODIFF doc

[gregberge]

Done in webdriverio package.