CHANGELOG.md in sidekiq_prometheus-0.9.0 vs CHANGELOG.md in sidekiq_prometheus-0.9.1

@@ -1,6 +1,18 @@
 CHANGELOG
 
+<a name="v0.9.0"></a>
+## [v0.9.0](https://github.com/fastly/sidekiq-prometheus/compare/v0.8.1...v0.9.0) (2019-03-18)
+
+### Features
+
+* Custom Metrics
+
+### Pull Requests
+
+* Merge pull request [#4](https://github.com/fastly/sidekiq-prometheus/issues/4) from fastly/custom_metrics-fix[#2](https://github.com/fastly/sidekiq-prometheus/issues/2)
+* Merge pull request [#3](https://github.com/fastly/sidekiq-prometheus/issues/3) from fastly/doc_refinement_(fix-[#1](https://github.com/fastly/sidekiq-prometheus/issues/1))
+
+
 <a name="v0.8.1"></a>
 ## v0.8.1 (2019-02-08)
 
-Initial Release!