Immutable.js support

[liorbrauer]

Hi,

I'd like to use this tool, but with a state object that is an Immutable.Map. Looking at the source, support could be added pretty easily by accepting a configuration boolean which implements a simple transformation of the getState function to getState().toJS().

Could this feature be added?

Thanks

[elaijuh]

Just PR to make it immutable supported
#3

[liorbrauer]

@elaijuh 👍 Thanks for working on this!

(EDIT: removed my previous comment about version, my bad)

[opichals]

👍

[alk-jerber]

+1