Add #31 to CHANGELOG

Author: aaron-lane

CHANGELOG.md

@@ -8,6 +8,10 @@ Extending the adopted spec, each change should have a link to its corresponding
 
 ## [Unreleased]
 
+### Fixed
+
+- Terraform 0.12 syntax in submodules. [#31]
+
 ## [1.0.0] - 2019-08-05
 
 ### Changed
@@ -48,6 +52,7 @@ Extending the adopted spec, each change should have a link to its corresponding
 [0.2.0]: https://github.com/terraform-google-modules/terraform-google-container-vm/compare/v0.1.1...v0.2.0
 [0.1.1]: https://github.com/terraform-google-modules/terraform-google-container-vm/compare/v0.1.0...v0.1.1
 
+[#31]: https://github.com/terraform-google-modules/terraform-google-container-vm/pull/31
 [#27]: https://github.com/terraform-google-modules/terraform-google-container-vm/pull/27
 [#21]: https://github.com/terraform-google-modules/terraform-google-container-vm/pull/21
 [#20]: https://github.com/terraform-google-modules/terraform-google-container-vm/pull/20