README isn't clear, that you require "zsh" for these to work

[benwinding]

Hey Mate,

This is an amazing repo! I love the file structure you've made and am impressed by the ease of use.

Problem

The only thing that got me was running the thing! I know it's small, but it doesn't mention that you require zsh for this to function. The problem is the install script scripts/bootstrap works in bash and I assumed all dotfiles would too.

Just a small change in the README file saying you need zsh installed as default shell would help this for other noobs like me 👌

Cheers,
Ben