Is your feature request related to a problem? Please describe.
There is a few projects i'm working on where its important to be able to scan development packages in composer files (packages-dev array), but dependecy check currently only parses packages in the packages array.

Describe the solution you'd like
A possible flag or argument that could be passed that enables the packages-dev array to be parsed by dependecy check.

Describe alternatives you've considered
A possible work-around is after using checkout, modifying the composer.lock file to rename packages-dev to packages, which will make dependecy check scan it