Support Biometrics on MacOS

[atomdmac]

One of my favorite things about Enpass is the ability to quickly unlock my vaults with my fingerprint on my Mac. What are the chances of supporting that?

[hazcod]

I believe we would be able to store the master password in the keychain and unlock that using biometrics.
However i'm not directly aware of any libraries to do such a thing.
e.g. https://github.com/keybase/go-keychain/issues/61

[hazcod]

Blocked by keybase/go-keychain#107