Httpx-oauth

Bug fixes
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* Fix `GitHubOAuth2.refresh_token` error handling when the token is invalid.

Breaking changes
----------------

* Exception classes have been moved to `httpx_oauth.exceptions` module.
* Exception classes now have a required `message` property.
* `GetAccessTokenError`, `RefreshTokenError` and `RevokeTokenError` accept an optional `response property`.

New features and improvements
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* Add support for `client_secret_basic` authentication method.
* Improved error handling: network errors and JSON decode errors are now properly handled.
* Code is now entirely documented with docstrings.

Bug fixes
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* Handle GitHub refresh tokens errors not following the standard.

Improvements
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* Add support for GitHub refresh tokens [[Documentation](https://frankie567.github.io/httpx-oauth/oauth2/#github)]

Improvements
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* Enable Python 3.12 support
* Bump dependencies:
* `httpx >=0.18,<0.28`

Bug fixes and improvements
--------------------------

* Fix 317: GitHub client returns the primary email by default. Thanks lloesche 🎉
* Bump dependencies:
* `httpx >=0.18,<0.27`