Feature/migrate to rxjava3

[klamborowski]

I'm working on migrating RxLifecycle to rxjava3 and one of dependency is Navi, so I decided to migrate it to rxJava3 also.

[dlew]

Thanks for working on this, but navi is deprecated and no more dev will be taking place with it: https://github.com/trello/navi#deprecated

[klamborowski]

I saw it later, but it was too late 😅

You can think about archiving repository: https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-archiving-repositories

[dlew]

Hmm, I didn't know about archiving - I'll consider it!