Replaced REQUIRE files by a suitable Project.toml

[magister-ludi]

The changes allow Netpbm to be installed correctly with Julia v1.3 (see #16) I've kept the version at v0.3.1 Tests are passing.

[timholy]

Sweet! FYI we also need to add [compat] bounds on all the dependencies for this to be something that will be automatically merged to the General registry. But let's merge this since it's already an improvement.

[magister-ludi]

Sweet! FYI we also need to add [compat] bounds on all the dependencies for this to be something that will be automatically merged to the General registry. But let's merge this since it's already an improvement.

I'd be happy to try to do that. Can you point me to relevant documentation?

[timholy]

Documentation on the compat format: https://julialang.github.io/Pkg.jl/v1/compatibility/
For the announcement: https://discourse.julialang.org/t/announcement-automatic-merging-for-the-general-registry/29961

You can also see other packages' Project.toml files, e.g., ImageMagick.

[magister-ludi]

Thanks for the tips. I'll take a look and report back.