Update CHANGELOG.md

Author: ludoo

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.5.3]
+
+- allow customizing environment variables
+
+## [1.5.2]
+
+- fix errors when plan has no variables
+
 ## [1.5.1]
 
 - add support for `-var-file` flag
@@ -67,7 +75,9 @@ 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/v1.5.1...HEAD
+[Unreleased]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.5.3...HEAD
+[1.5.3]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.5.2...v1.5.3
+[1.5.2]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.5.1...v1.5.2
 [1.5.1]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.4.1...v1.5.0
 [1.4.1]: https://github.com/GoogleCloudPlatform/terraform-python-testing-helper/compare/v1.3.0...v1.4.1