Support 2-factor auth with security key

[dmwyatt]

The more we know about your system and use case, the more easily and likely we can help.

Environment info

• OS: Windows 10
• App Version (Command/Ctrl + ,): I just downloaded it and haven't logged in yet so I don't know!

Description of the problem / feature request / question:

I use a yubikey for 2 factor auth on github. After I click "Use security key" in the login dialog, nothing happens.

What should happen is that Windows prompts me for my security key...this is how it works through the github website.

If possible, provide a sample gist or screenshot: