* Added `MemoryCacheHandler`, a cache handler that simply stores the token info in memory as an instance attribute of this class.
* If a network request returns an error status code but the response body cannot be decoded into JSON, then fall back on decoding the body into a string.
* Added `DjangoSessionCacheHandler`, a cache handler that stores the token in the session framework provided by Django. Web apps using spotipy with Django can directly use this for cache handling.
### Fixed
* Fixed a bug in `CacheFileHandler.__init__`: The documentation says that the username will be retrieved from the environment, but it wasn't.
* Fixed a bug in the initializers for the auth managers that produced a spurious warning message if you provide a cache handler and you set a value for the "SPOTIPY_CLIENT_USERNAME" environment variable.
* Use generated MIT license and fix license type in `pip show`
## [2.18.0] - 2021-04-13
### Added
- Enabled using both short and long IDs for playlist_change_details
- Added a cache handler to `SpotifyClientCredentials`
- Added the following endpoints
* `Spotify.current_user_saved_episodes`
* `Spotify.current_user_saved_episodes_add`
* `Spotify.current_user_saved_episodes_delete`
* `Spotify.current_user_saved_episodes_contains`
* `Spotify.available_markets`
### Changed
- Add support for a list of scopes rather than just a comma separated string of scopes
### Fixed
* Fixed the bugs in `SpotifyOAuth.refresh_access_token` and `SpotifyPKCE.refresh_access_token` which raised the incorrect exception upon receiving an error response from the server. This addresses #645.
* Fixed a bug in `RequestHandler.do_GET` in which the non-existent `state` attribute of `SpotifyOauthError` is accessed. This bug occurs when the user clicks "cancel" in the permissions dialog that opens in the browser.
* Cleaned up the documentation for `SpotifyClientCredentials.__init__`, `SpotifyOAuth.__init__`, and `SpotifyPKCE.__init__`.
## [2.17.0] - 2021-02-28
### Changed
- moved os.remove(session_cache_path()) inside try block to avoid TypeError on app.py example file
- A warning will no longer be emitted when the cache file does not exist at the specified path
- The docs for the `auth` parameter of `Spotify.init` use the term "access token" instead of "authorization token"
- Changed docs for `search` to mention that you can provide multiple types to search for
- The query parameters of requests are now logged
- Deprecate specifing `cache_path` or `username` directly to `SpotifyOAuth`, `SpotifyPKCE`, and `SpotifyImplicitGrant` constructors, instead directing users to use the `CacheFileHandler` cache handler
- Removed requirement for examples/app.py to specify port multiple times (only SPOTIPY_REDIRECT_URI needs to contain the port)
### Added
- Added log messages for when the access and refresh tokens are retrieved and when they are refreshed
- Support `market` optional parameter in `track`
- Added CacheHandler abstraction to allow users to cache tokens in any way they see fit
### Fixed
- Fixed Spotify.user_playlist_reorder_tracks calling Spotify.playlist_reorder_tracks with an incorrect parameter order
- Fixed deprecated Urllib3 `Retry(method_whitelist=...)` in favor of `Retry(allowed_methods=...)`
* Support `position_ms` optional parameter in `start_playback`
* Add `requests_timeout` parameter to authentication methods
* Make cache optional in `get_access_token`
* Support for `playlist_cover_image`
* Support `after` and `before` parameter in `current_user_recently_played`
* CI for unit tests
* Automatic `token` refresh
* `auth_manager` and `oauth_manager` optional parameters added to `Spotify`'s init.
* Optional `username` parameter to be passed to `SpotifyOAuth`, to infer a `cache_path` automatically
* Optional `as_dict` parameter to control `SpotifyOAuth`'s `get_access_token` output type. However, this is going to be deprecated in the future, and the method will always return a token string
* Optional `show_dialog` parameter to be passed to `SpotifyOAuth`
* Both `SpotifyClientCredentials` and `SpotifyOAuth` inherit from a common `SpotifyAuthBase` which handles common parameters and logics.
* Support for `playlist_tracks`
* Support for `playlist_upload_cover_image`
* `user_playlist_tracks` doesn't require a user anymore (accepts `None`)
* Deprecated `user_playlist` and `user_playlist_tracks`
* Fixed broken examples in README, examples and doc
* Allow session keepalive
* Bump requests to 2.20.0
* Fixed inconsistent behaviour with some API methods when
a full HTTP URL is passed.
* Fixed invalid calls to logging warn method
* Support for `playlist` to get a playlist without specifying a user
* Support for `current_user_saved_albums_delete`
* Support for `current_user_saved_albums_contains`
