add changelog

CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+## Latest
+
+* Registry response to module version download path must be 204, not 200, because the server returns empty body. Download link is passed by means of X-Terraform-Get response header. Both terraform and opentofu support that (in fact they do support both 200 and 204). None of the production registries use 204 at the moment.
+* Added response errors to the model.
+* Updated the regex for module download URL
+* Added release github action, publishing the resulting openapi specification.
+
+## v0.1.0
+
+* Initial API specification release with both smithy and openapi.
+* Added github action to validate, build the model.