Migrate to pyproject.toml

[deronnax]

pyproject.toml is the way to go

[deronnax]

@oz123 is it good for you now?

[oz123]

I'm not going to be able to merge this PR.. Not an owner here. I'm just sharing my thoughts.
You should also remove the optional dependancy on pipenv.

[deronnax]

@oz123 I want to do 1:1, removing the pipenv dependencies, even undue, would be more than the minimum. I will do if the project owner ask for it, though. If he ever shows up.

[deronnax]

@yeisonvargasf can I have a workflow run please?

[deronnax]

@yeisonvargasf it's ready to be merged if you're OK with that. Btw, I think we should follow @oz123 's recommandation: the optional requirements on an old version of Pipenv doesn't make sense (it can't be enforced that way).

[yeisonvargasf]

Hi @oz123, thank you for reviewing this PR; I appreciate your help here.

@deronnax, thank you for this PR; I agree with the @oz123 recommendation about removing the Pipenv constraint; My idea is to remove it after updating the PipfileUpdater. Although the pipenv constraint can't be enforced that way (If already installed), I think that works in the case of a fresh CI environment with no pipenv pre-installed.

Please let me know if the comment about the CI case is wrong; if the constraint doesn't work in that case, we can remove it in this same PR; otherwise, I'm happy to merge this as it is.