integratedexperts/behat-screenshot is abandoned and has moved to drevops/behat-screenshot

[grahamethompson]

This package is abandoned and no longer maintained. The author suggests using the drevops/behat-screenshot package instead.

https://packagist.org/packages/integratedexperts/behat-screenshot

Updated the namespace and quoted scalars
grahamethompson@bbe9871

govcms/require-dev would need to be updated to require the drevops dependency. govCMS/require-dev#9

[AlexSkrypnyk]

@steveworley
I'm happy to provide a PR - please let me know which repo and if this is still required.