Bump CHANGELOG.md to v0.20.2

CHANGELOG.md

@@ -5,6 +5,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ## [Unreleased]
 
+## [0.20.2] - 2016-12-09
+### Added
+- Optional `Pliny::Middleware::Metrics` middleware that reports number of
+  requests, request latency and class of HTTP status codes.
+  ([#289](https://github.com/interagent/pliny/pull/289))
+
 ## [0.20.1] - 2016-12-08
 ### Added
 - `Pliny::Metrics.measure` now supports `value` as a keyword parameter as well
@@ -69,8 +75,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 - Useless code coverage reports. ([#255](https://github.com/interagent/pliny/pull/255))
 - Cleanup of active database connections after migration runs. ([#257](https://github.com/interagent/pliny/pull/257))
 
-[Unreleased]: https://github.com/interagent/pliny/compare/v0.21.0...HEAD
-[0.20.1]: https://github.com/interagent/pliny/compare/v0.20.0...v0.21.0
+[Unreleased]: https://github.com/interagent/pliny/compare/v0.20.2...HEAD
+[0.20.2]: https://github.com/interagent/pliny/compare/v0.20.1...v0.20.2
+[0.20.1]: https://github.com/interagent/pliny/compare/v0.20.0...v0.20.1
 [0.20.0]: https://github.com/interagent/pliny/compare/v0.19.0...v0.20.0
 [0.19.0]: https://github.com/interagent/pliny/compare/v0.18.0...v0.19.0
 [0.18.0]: https://github.com/interagent/pliny/compare/v0.17.1...v0.18.0