Update README.md

Author: seratch

README.md

@@ -21,7 +21,7 @@ The **Python Slack SDK** allows interaction with:
 - `slack_sdk.models`: for constructing UI components using easy-to-use builders
 - `slack_sdk.rtm`: for utilizing the [RTM API][rtm-docs]
 
-If you want to use our [Events API][events-docs] and Interactivity features, please check the [Bolt for Python][bolt-python] library. Details on the Tokens and Authentication can be found in our [Auth Guide](https://slack.dev/python-slack-sdk/auth.html).
+If you want to use our [Events API][events-docs] and Interactivity features, please check the [Bolt for Python][bolt-python] library. Details on the Tokens and Authentication can be found in our [Auth Guide](https://slack.dev/python-slack-sdk/installation/).
 
 ## slackclient is in maintenance mode