[Change Log] Minor fix.

Author: omazin

CHANGELOG.md

@@ -83,4 +83,4 @@ project adheres to [Semantic Versioning](http://semver.org/).
 [#42]: https://github.com/terraform-google-modules/terraform-google-vm/pull/42
 [#43]: https://github.com/terraform-google-modules/terraform-google-vm/pull/43
 [#44]: https://github.com/terraform-google-modules/terraform-google-vm/pull/44
-[#44]: https://github.com/terraform-google-modules/terraform-google-vm/pull/57
+[#57]: https://github.com/terraform-google-modules/terraform-google-vm/pull/57