Bump rxjava from 2.2.19 to 2.2.20 (#323)
Bump rxjava from 2.2.19 to 2.2.20 (#323)

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 2.2.19 to 2.2.20.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Changelog](https://github.com/ReactiveX/RxJava/blob/v2.2.20/CHANGES.md)
- [Commits](https://github.com/ReactiveX/RxJava/compare/v2.2.19...v2.2.20)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
jraska/github-client