Python-anvil

- Add support for `arrayBuffer` response type.
- Use `arrayBuffer` type underneath `buffer` response type to stop triggering `buffer` deprecation warning. https://github.com/anvilco/node-anvil/pull/442
- Updated various dependencies

- Swap out `node-fetch` for `anvilco/node-fetch` in order to fix `Premature close`. https://github.com/anvilco/node-fetch/pull/1
- Fixed bug around some error handling. https://github.com/anvilco/node-anvil/issues/376
- Updated various dependencies

- Update `node-fetch` to latest and drop `form-data`. https://github.com/anvilco/node-anvil/issues/239
- Update various dependencies

- Fixed issue with `requests_toolbelt` (`gql` dependency) using an incompatible version of `urllib3`.
This caused an error of `ImportError: cannot import name 'appengine'` to be thrown.

- **[BREAKING CHANGE]** [`graphql-python/gql`](https://github.com/graphql-python/gql) is now the main GraphQL client
implementation. All functions should still work the same as before. If there are any issues please let us know
in `python-anvil` GitHub issues.
- Updated examples to reflect new GraphQL implementation and added `examples/make_graphql_request.py` example.

- Non-dynamic `require`s in GraphQL modules.
- Dependency updates.