Bump v0.4.0

Signed-off-by: Xabier Larrakoetxea <[email protected]>

Author: slok

CHANGELOG

@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+## [0.4.0] - 2019-03-27
+
 ### Breaking changes
 * The Recorder methods now receive a context argument.
 
@@ -33,7 +35,8 @@
 * Prometheus recorder.
 
 
-[unreleased]: https://github.com/slok/go-http-metrics/compare/v0.3.0...HEAD
+[unreleased]: https://github.com/slok/go-http-metrics/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/slok/go-http-metrics/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/slok/go-http-metrics/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/slok/go-http-metrics/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/slok/go-http-metrics/releases/tag/v0.1.0