Update changelog.mdx

Author: mintlify[bot]

changelog.mdx

@@ -7,6 +7,15 @@ noindex: true
 
 <Update label="September 14 - September 19" tags={["Improvements"]} rss={{ title: "Weekly Updates", description: "GitLab integration enhancements, app router migration progress, authentication improvements, and bug fixes" }}>
 
+## New Slack bot integration
+
+- **Major release**: Slack bot for instant documentation access - responds to DMs, @mentions, and questions in your `#ask-ai` channel
+- Zero-friction setup with one-click installation directly from your Mintlify dashboard
+- Contextual answers by searching your entire documentation to provide relevant, accurate responses
+- Deflect support interruptions by turning daily questions into instant, self-serve answers
+
+Learn more in our [Slack bot guide](/ai/slack-bot).
+
 ## GitLab integration enhancements
 
 - Enhanced GitLab connection UI in dashboard settings for easier repository management