Including a dev tool

[JohnBerd]

Thank you for this great library. It helps me easily separating my business logic from my React code.

I use a logger to display the state of my micro observables and it is a bit of a mess.

I read in a previous issue that your team is working on version 2.x for releasing a dev tool (similar to the Redux dev tool interface I guess)

Is the work about it still in progress? It would be great to have some updates

Cheers :)