Update RxSwift to latest version (5.0)

[farshadtx]

No description provided.

[rxswiftcommunity]

	Warnings
⚠️	It looks like code was changed without adding anything to the Changelog. If this is a trivial PR that doesn't need a changelog, add #trivial to the PR title or body.

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[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 2.02%.
The diff coverage is 97.05%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   92.71%   94.73%   +2.02%     
==========================================
  Files           4        4              
  Lines         247      247              
==========================================
+ Hits          229      234       +5     
+ Misses         18       13       -5

Impacted Files	Coverage Δ
Source/Common/ActivityIndicator.swift	100% <100%> (ø)	⬆️
Tests/TwoWayBindingTests.swift	100% <100%> (ø)	⬆️
Source/iOS/TwoWayBinding.swift	76.36% <92.3%> (+9.09%)	⬆️

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[farshadtx]

@freak4pc can you help on this?

[freak4pc]

Looks good! One note and a few renames. Thanks!

[freak4pc]

Looks good. Thanks!