CLI is missing peer dependencies

[Soreine]

slate, immutable etc. are peer dependencies, and are not installed when doing npm i -g slate-hyperprint

[zhouzi]

I'd suggest two possible solutions:

1. Publish slate-hyperprint-cli as a separate package with a dependency on slate-hyperpint and its peer dependencies.
2. Advise users to install the global CLI through install-peerdeps, e.g install-peerdeps slate-hyperprint -g (I didn't give that a try, I believe it'd work).

EDIT: I just noticed that the CLI's peer dependencies are not declared, which makes sense as the CLI's dependencies are different from slate-hyperprint's main purpose. A separate package would probably be the way to go.