[Docs] Remove the duplicated python_anvil.types changelog entry

CHANGELOG.md

@@ -39,7 +39,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The client's queries and mutations are checked against the API schema in CI, and `make update-schema` refreshes the schema from the published `@anvilco/types` package.
 - Add `test-client.py`, which runs every method against a real environment: `ANVIL_API_KEY=... make test-client`.
 - Add `python_anvil.types`: pydantic models generated from the API's OpenAPI spec and GraphQL schema, the Python counterpart of `@anvilco/types`. `types.rest` has the REST request bodies, `types.graphql` every type in the schema, and `types.operations` the arguments of every query and mutation, like `CreateEtchPacketArgs`. The client's payload models extend them, so `FillPDFPayload`, `EtchSigner`, `CreateEtchPacketPayload` and `ForgeSubmitPayload` now accept every option the API has. BREAKING: they also validate those options the way the API documents them: an enum value the API doesn't accept (like `signature_mode="wave"`), or a number out of its documented range (like `token_valid_for_minutes` above a day), is a `ValidationError` before anything is sent, where 5.x passed it through for the API to reject. `font_size` and `routing_order` keep accepting any value, as they did. `ForgeSubmitPayload.webhook_url` is a plain `str` now, not an `HttpUrl`.
-- Add `python_anvil.types`: pydantic models generated from the API's OpenAPI spec and GraphQL schema, the Python counterpart of `@anvilco/types`. `types.rest` has the REST request bodies, `types.graphql` every type in the schema, and `types.operations` the arguments of every query and mutation, like `CreateEtchPacketArgs`. The client's payload models extend them, so `FillPDFPayload`, `EtchSigner`, `CreateEtchPacketPayload` and `ForgeSubmitPayload` now accept every option the API has, and reject misspelled enum values. `ForgeSubmitPayload.webhook_url` is a plain `str` now, not an `HttpUrl`.
 - The README now documents every method, option and error, and the `docs/` folder and mkdocs are gone. CONTRIBUTING.md covers development, the integration test script, the generated types and publishing.
 - A Sync API Types workflow refreshes `schema/` and regenerates `python_anvil/types` after each production deploy, opening a PR when anything changed. `make update-schema generate` does the same by hand.