Migrated to use RxJava3

[steve1rm]

• Bumped versions to use the latest dependences
• Migrated to use RxJava3
• Simplified some code

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5a6de94). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master      #5   +/-   ##
========================================
  Coverage          ?   9.80%           
  Complexity        ?       7           
========================================
  Files             ?      13           
  Lines             ?     102           
  Branches          ?       8           
========================================
  Hits              ?      10           
  Misses            ?      90           
  Partials          ?       2           

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[steve1rm]

@whalemare If you get time can you review this PR.

[steve1rm]

Hi @whalemare any chance to review this PR?

[whalemare]

Thank you, I merge it, but not publish in .aar, for this I need some time