update undo package

packages/undo/CHANGELOG.md

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+## 1.6.0
+- Updated SDK constraints to `^3.5.0`
+- Updated `dev_dependencies`
+- Modernized example application
+- Updated documentation
+
+## 1.5.0
+
+- Updating to Dart 3.0.0
+- Removing unnecessary `packageVersion`
+
+## 1.4.0
+
+* Null safety
+
+## 1.3.1
+
+- Example updated
+- Fixed first item not being able to be undone
+
+## 1.3.0
+
+- Async support
+
+## 1.2.0
+
+- [max] -> [limit]
+- Removing Flutter support for use in AngularDart and web applications
+- Updating tests
+- Deprecating [clear] in favor of [clearHistory]
+- Adding Generics support
+- Simplified for adding group or single change
+- Added label option for every change
+- Updating docs
+- Removing [StreamController](https://gist.github.com/rodydavis/229a69fbc9294a58a46155edef677a8f) and [ValueNotifier](https://gist.github.com/rodydavis/8f58b99999928c3be141fb4c986ebece) Implementations in favor of [Bloc PR](https://github.com/felangel/bloc/tree/master/packages/replay_cubit)
+- Adding [packageVersion]
+- Updating Example
+- Adding [SimpleStack]
+- Adding Dart/Html Web Example
+
+## 1.1.0
+
+- Adding StreamController and ValueNotifier Implementations
+
+## 1.0.1
+
+* Adding Stream API
+
+## 1.0.0
+
+* Forked abandoned project and updated with latest Flutter