Version 1.0.0 - Bump of RxSwift dependency to 6.x.x (currently 6.9.0)…

…, bump minimum iOS requirement to iOS 15 (#26)

* Bump minimum iOS version requirement to iOS 15. Bump RxSwift dependency
version to 6.9.0

* Bump iOS version in cocoapods

* Fix tests in CI

* Lock in the RxSwift dependency to 6.x.x

* Fixing CI

* Version 1.0.0

* Update readme

Version 0.16.3

Prepare for release 0.16.2

Version 0.16.1

Prepare for release 0.15.4

Version 0.15.4

Version 0.15.3

Version 0.15.2

Version 0.15.1

Version 0.15.0