[FSSDK-13348] prep for release 4.0.1 (#130)

* chore: prep for release 4.0.1

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* docs: add 4.0.1 release notes

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* docs: detail Swift SDK 6.0.1 changes in 4.0.1 release notes

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: muzahidul-opti

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Optimizely Flutter SDK Changelog
 
+## 4.0.1
+October 29th, 2026
+
+### Enhancements
+* Bump native Swift SDK to 6.0.1 ([#129](https://github.com/optimizely/optimizely-flutter-sdk/pull/129)):
+  * Custom storage directory: `DataStoreFile` and `DefaultEventDispatcher` can be configured with a custom directory for their persisted files ([swift-sdk#668](https://github.com/optimizely/swift-sdk/pull/668))
+
+### Bug Fixes
+* ODP: async `fetchQualifiedSegments` now forwards its `options`, so `.ignoreCache` and `.resetCache` are honored (Swift SDK 6.0.1, [swift-sdk#667](https://github.com/optimizely/swift-sdk/pull/667))
+
+
 ## 4.0.0
 October 16th, 2026
 

README.md

@@ -37,7 +37,7 @@ Other Flutter platforms are not currently supported by this SDK.
 To add the flutter-sdk to your project dependencies, include the following in your app's pubspec.yaml:
 
 ```
-   optimizely_flutter_sdk: ^4.0.0
+   optimizely_flutter_sdk: ^4.0.1
 ```
 
 Then run 

lib/package_info.dart

@@ -3,5 +3,5 @@
 
 class PackageInfo {
   static const String name = 'optimizely_flutter_sdk';
-  static const String version = '4.0.0';
+  static const String version = '4.0.1';
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: optimizely_flutter_sdk
 description: This repository houses the Flutter SDK for use with Optimizely Feature Experimentation, Optimizely Full Stack (legacy), and Optimizely Rollouts.
-version: 4.0.0
+version: 4.0.1
 homepage: https://github.com/optimizely/optimizely-flutter-sdk
 
 environment: