Release new version so async callbacks are easily available

[docech]

Hello,

sorry for creating issue for this but I don't know how else contact you. Is it possible to create new tag so async callbacks are available when running npm install typestate?

[eonarheim]

@docech Apologies, I should have some time soon to release the new version

[felladrin]

Hi @eonarheim, thanks for the effort put into this lib! I’d like to use that new release too. Hope you had find some time to push a new version to npm.