Add CHANGELOG entry for 0.4.0

Author: aaron-lane

CHANGELOG.md

@@ -8,6 +8,12 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 ## [Unreleased]
 
+## [0.4.0] - 2019-06-17
+
+### Added
+
+- A variable which configures the time zone of the scheduler job. [#5]
+
 ## [0.3.0] - 2019-06-11
 
 ### Added
@@ -26,10 +32,13 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 - Initial release
 
-[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.3.0...HEAD
+[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/releases/tag/v0.1.0
 
+[#5]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/pull/5
+
 [keepachangelog-site]: https://keepachangelog.com/en/1.0.0/
 [semver-site]: https://semver.org/spec/v2.0.0.html