Update CHANGELOG.md for v5.20 release
@@ -8,6 +8,8 @@ Versioning](http://semver.org/spec/v2.0.0.html).
## Unreleased
+## [5.20.0] - 2020-05-12
+
### Added
- Added ability to make the Resty HTTP Timeout configurable.
- Added the `event.is_silenced` & `event.check.is_silenced` field selectors.
