Update CHANGELOG.md

Author: ludoo

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.6.3]
+
+- Adds support for the upgrade argument of the init command (@lorengordon) [#40]
+
 ## [1.6.2]
 
 - Fix to return an empty map when no child modules are present in plan
@@ -104,7 +108,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - remove the `teardown` method
   - unify the `plan` and `plan_out` methods
 
-[Unreleased]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.6.2...HEAD
+[Unreleased]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.6.3...HEAD
+[1.6.3]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.6.1...v1.6.3
 [1.6.2]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.6.1...v1.6.2
 [1.6.1]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.6.0...v1.6.1
 [1.6.0]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.5.7...v1.6.0