color flags

[Raynos]

Allow running licensecheck with --yellow or --red to not render all the green MIT noise.

I generally only care about "which deps have no licence or have a weird licence file or have copy left (GPL) licences"

[marcello3d]

Maybe a license filter? e.g. --hide MIT,zlib,BSD

[Raynos]

That could work too. --hide MIT gets rid of 90% :D