Bump the changelog for the 5.2.1 release
@@ -7,6 +7,8 @@ Versioning](http://semver.org/spec/v2.0.0.html).
## Unreleased
+## [5.2.1] - 2019-02-11
+
### Fixed
- Fixed a regression in the agent that would not allow proxy checks to be
run for subsequent executions.
