use subscribe to persist to localStorage

[ghost]

more discoverable than #1608

[gaearon]

The wording is not entirely what I wanted. Maybe something like this?

You can use subscribe() to update the UI in response to state changes.
Normally you’d use a view binding library (e.g. React Redux) rather than subscribe() directly.
However it can also be handy to persist the current state in the localStorage.

[ghost]

Yep, yours is clearer.

[gaearon]

Feel free to use it in your PR or tweak it. It’s your initiative, I’m just trying to be helpful. 😉

[ghost]

Did I do it right? (I've never done more than one commit on a branch for a PR.)

[gaearon]

Yep, thanks!