Use Keybase to hold encrypted notes for notable app

My notes for notable app v1.8.0

Assumes you've set up a private git repo inside keybase to hold your encrypted notes.

Setting up on a new machine:

$ brew cask install notable keybase

$ git submodule update --init --recursive

In case of fatal: transport 'keybase' not allowed

$ git config --global --add protocol.keybase.allow always