Add support for ranch_tcp opts: ip, ipv6_v6only, inet, inet6

[Nezteb]

Addresses #305

It's a bit awkward because ranch_tcp's listen options are all keyword tuples except for :inet and :inet6, so I borrowed plug_cowboy's method of passing the network atoms: https://github.com/elixir-plug/plug_cowboy/blob/v2.6.0/lib/plug/cowboy.ex#L360-L361

[polvalente]

Please run the formatter so we can merge :)

[Nezteb]

@polvalente That's odd, the formatter passes on my machine. 😅

[polvalente]

@polvalente That's odd, the formatter passes on my machine. 😅

I think you need to run with Elixir 1.14 (the same as CI)

[Nezteb]

I think you need to run with Elixir 1.14 (the same as CI)

Oh, the .tool-versions file specified 1.13 so that's what my asdf install was using. 😄

EDIT: Okay format is fixed; I also bumped the Elixir versions for asdf and the Mix project to match what CI is using.