Alfred Workflow for obtaining TOTP codes from a YubiKey.
The workflow uses `ykman oath` under the hood.
YubiKey Manager and Python 3 are required. To install both with Homebrew execute
$ brew install ykman python3
In Alfred command line type `yo` (optionally) followed by a filter term matching an account you want to get a TOTP code
for. The code will be copied to the clipboard in transient mode (i.e. it will *not* actually show up in clipboard