Support for RxSwift 6.0

[devandanger]

[rxswiftcommunity[bot]]

Danger run resulted in 1 warning; to find out more, see the checks page.

Generated by :no_entry_sign: dangerJS

[engali94]

Could you check the requirements in the README are they still valid or needs to be updated?

[skantus]

Hi, @devandanger I realize that your branch presents some troubles with Firebase Authentication version, this thread follows open?

cc:/ @engali94