docs: added .changeset

Author: Ykrej

.changeset/support_non_standard_http_codes.md

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+# Summary
+
+Added support for responses with non-standard HTTP Status Codes. Off by default, enabled with `allow_int_response_codes`.
+
+# Problem
+
+Currently if a response with a status code that does not exist in `http.HTTPStatusCode` a `ValueError` is raised. For example: `ValueError: 490 is not a valid HTTPStatus`.
+
+# Edge Case
+
+If a non-standard status code is received from an endpoint that doesn't define any responses with non-standard status codes the old behavior will appear.