add CHANGELOG.md

Author: robertpeteuil

CHANGELOG.md

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+# terraform-aws-certbot-cloudflare-lambda Changelog
+
+All notable changes to this project will be documented in this file.
+
+This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [2.0.0] - 2019-05-27
+
+- update for HCL2 in Terraform versions > 0.12
+- constrain AWS provider for terraform 0.12 version >= 2.12
+- added CHANGELOG.md
+
+## [1.1.4] - 2019-05-27
+
+- Update base layer for new Lambda runtime environment
+
+## [1.1.3] - 2019-05-08
+
+- Documentation Adjustments
+
+## [1.1.2] - 2019-04-12
+
+- constrain AWS provider to versions >= 2.0
+  - necessary due to [attribute values swap](https://www.terraform.io/docs/providers/aws/guides/version-2-upgrade.html#arn-and-layer_arn-attribute-value-swap) in versiions >= 2.0
+
+## [1.1.1] - 2019-03-30
+
+- update README.md
+
+## [1.1.0] - 2019-03-30
+
+- Add Terraform Major version pinning and aws region
+
+## [1.0.0] - 2019-03-30
+
+- Initial Release
+
+[2.0.0]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.1.4...2.0.0
+[1.1.4]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.1.3...1.1.4
+[1.1.3]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.1.2...1.1.3
+[1.1.2]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.1.1...1.1.2
+[1.1.1]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.1.0...1.1.1
+[1.1.0]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/compare/1.0.0...1.1.0
+[1.0.0]: https://github.com/robertpeteuil/terraform-aws-certbot-cloudflare-lambda/tree/1.0.0