Httpx-oauth

Breaking changes

* The return type of `get_id_email` is now `Tuple[str, Optional[str])`, which means the email is now optional and **can be `None`**.
* This will help to better support providers that don't always provide an email address.

New features and improvements

* New OpenID client, with automatic endpoints discovery. [[Documentation](https://frankie567.github.io/httpx-oauth/oauth2/#openid)]
* Okta client implementation revamped using the OpenID client as a basis.

Bug fixes

* Fix SVG logos

New features

* Add display name and SVG logo for some clients: Facebook, GitHub, Google, LinkedIn and Microsoft

Improvements

* OAuth2 client will now catch all 4XX errors, not only 400 ones.

New features

* Discord client added. [[Documentation](https://frankie567.github.io/httpx-oauth/oauth2/#discord)] Thanks williamhatcher 🚀

Improvements

* Allow customization of the `httpx.AsyncClient` by overloading the `get_httpx_client` method. [[Documentation](https://frankie567.github.io/httpx-oauth/oauth2/#customize-httpx-client)]
* Bump dependencies:
* `httpx >=0.18,<0.24`