Terminal color auto-detection no longer working with mintty (git-bash)

[aloucks]

Color auto-detection isn't working for mintty (git-bash) shells. Running with --color always or using winpty does show color correctly. Powershell and cmd.exe seem to work fine as well.

Color detection was working fine until I just updated via rustup. The issue is not present in beta.

[ehuss]

Looks like the update to the winapi crate in the rust repo broke tty detection. I have posted a fix at softprops/atty#28. If that goes through, we'll need to wait for a new release, and then bump the lock file in the rust repo.

[alexcrichton]

Thanks for tracking this down @ehuss!