Enable compatibility with redux-observable@1.x, redux@4.x and rxjs@6.x

[jdachtera]

Hi @BerkeleyTrue,

This pr enables compatibility with redux-observable@1.x, redux@4.x and rxjs@6.x. (without the need for the rxjs5 compat layer).

Let me know if you need anything to get this merged.

Cheers,
Jascha

[coveralls]

Coverage increased (+0.08%) to 91.429% when pulling c5ec31e on jdachtera:feature/rxjs6+redux-observable1.0 into af034a4 on BerkeleyTrue:master.

[jdachtera]

@BerkeleyTrue, any chance to get this merged?

[BentoumiTech]

@jdachtera Probably some changes would be also needed in the docs/api/README.md as createEpicMiddleware signature changed.

[jdachtera]

@Neophy7e, thanks! I'll add that as soon as possible.

[jdachtera]

@NeoPhy7e, @BerkeleyTrue, added the the documentation changes.
Let me know what you think!

[BentoumiTech]

@jdachtera @BerkeleyTrue I don't know if you were aware but there is currently two PR's in the redux-observable repo that aims to implement SSR directly in the library. Maybe your experience redux-observable and SSR could help out there.

• WIP: provide server side rendering support via sigterm/sigkill redux-observable/redux-observable#539
• Server side render redux-observable/redux-observable#412

[jdachtera]

@Neophy7e thanks for pointing this out. My impression of these discussions is that it doesn't seem to be easy to align on the technical implementation. Maybe then it's better to keep it as a separate library for now.

Also as a builtin feature it might increase the bundle size on the client side event though it would only be needed on the server.

Since there has been no activity by the maintainer I've published this under a new namespace for now so everyone can easily use it:
https://www.npmjs.com/package/@jdachtera/react-redux-epic

Cheers!

[BentoumiTech]

@jdachtera Thank you for making it available through npm.