Add CHANGELOG entry for 0.3.0

Author: aaron-lane

CHANGELOG.md

@@ -8,6 +8,12 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 ## [Unreleased]
 
+## [0.3.0] - 2019-06-11
+
+### Added
+
+- Submodule which cleans up old projects.
+
 ## [0.2.0] - 2019-04-02
 
 ### Added
@@ -20,7 +26,8 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 - Initial release
 
-[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.3.0...HEAD
+[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