Bump rxjava from 2.2.18 to 2.2.19
Bump rxjava from 2.2.18 to 2.2.19

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 2.2.18 to 2.2.19.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Changelog](https://github.com/ReactiveX/RxJava/blob/v2.2.19/CHANGES.md)
- [Commits](https://github.com/ReactiveX/RxJava/compare/v2.2.18...v2.2.19)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
wendigo/chrome-reactive-kotlin,wendigo/chrome-reactive-kotlin,wendigo/chrome-reactive-kotlin,wendigo/chrome-reactive-kotlin