Offer to take over maintenance

[gdalle]

Hi @chkwon,

First of all, thank you for setting up this package, which has been very inspirational for my own research. I'm gonna do a lot of traffic assignment in the coming months, and I was wondering whether you'd accept transferring maintenance of the package to me? In practice, all that would entail is me opening a PR to the General Registry and switching the repo URL to my fork https://github.com/gdalle/TrafficAssignment.jl.

In this fork, I have updated all of the code and CI, but also made several major upgrades:

• outsourcing the optimization to FrankWolfe.jl
• automatic downloads and file management with DataDeps.jl
• plotting utilities with Makie.jl and Tyler.jl
• parsing of another, more recent dataset, and fixing some bugs with TransportationNetworks

I plan to improve things further as my research goes deeper into the topic. What do you think?