Save password in keychain

[dvkch]

Hi there,

First of all, thanks for this plugin which has been an amazing tool for me for months now.

I have been wondering, would you consider adding the ability to remember the FTP password in the macOS keychain? Fastlane seems to do this for the Apple ID session token, maybe the code to do so is already usable in the fastlane core.

Thanks a lot,

Stan