Update changelog for sdk-js v0.0.135 (#254)

Author: devin-ai-integration[bot]

content/Changelog/sdk-js.mdx

@@ -7,6 +7,16 @@ import { Callout } from 'fumadocs-ui/components/callout';
 
 This page documents the release history of the [Agentuity JavaScript SDK](https://github.com/agentuity/sdk-js).
 
+## v0.0.135
+
+<Callout type="info">
+  Released: August 4, 2025
+</Callout>
+
+### Changes
+
+- **Added**: Slack IO integration with support for parsing and replying to Slack messages ([PR #153](https://github.com/agentuity/sdk-js/pull/153))
+
 ## v0.0.134
 
 <Callout type="info">