Add date for 1.2.0 to CHANGELOG

Author: Aaron Lane

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 ## [Unreleased]
 
+## [1.2.0] - 2019-11-20
+
 ### Added
 
 - The `function_timeout_s` variable is exposed on the `project_cleanup` submodule.
@@ -63,7 +65,8 @@ and this project adheres to [Semantic Versioning][semver-site].
 
 - Initial release
 
-[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v1.1.1...HEAD
+[Unreleased]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v1.2.0...HEAD
+[1.2.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v1.1.1...v1.2.0
 [1.1.1]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v1.1.0...v1.1.1
 [1.1.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/terraform-google-modules/terraform-google-scheduled-function/compare/v0.4.1...v1.0.0