This is the first stable version of [slack_sdk](https://pypi.org/project/slack-sdk/) v3. The remarkable updates in this major version are:
* Newly added OAuth flow support
* Better Async/sync separation for `WebClient` and `WebhookClient`
* Renamed packages (from `slack` to `slack_sdk`) with deprecation warnings
Refer to [the documents](https://slack.dev/python-slack-sdk/) for details. The migration guide for `slackclient` v2.x users is available at https://slack.dev/python-slack-sdk/v3-migration/