[flutter_lints] Replace "flutter pub add --dev" with "dev:" (flutter#5260)

This pull request is to replace `�dev` with `dev:`, as this is the newer way and is used in the Flutter documentation.
https://dart.dev/tools/pub/cmd/pub-add#dev-dependency
https://docs.flutter.dev/data-and-backend/serialization/json#setting-up-json_serializable-in-a-project

Author: tatsuyafujisaki

packages/flutter_lints/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 3.0.1
+
+* Replaces `flutter pub add --dev` with `dev:` in README.md.
+
 ## 3.0.0
 
 * Updated `package:lints` dependency to version 3.0.0, with the following changes:

packages/flutter_lints/README.md

@@ -19,7 +19,7 @@ package. Entities created before that version can use these lints by following
 these instructions:
 
 1. Depend on this package as a **dev_dependency** by running
-  `flutter pub add --dev flutter_lints`.
+  `flutter pub add dev:flutter_lints`.
 2. Create an `analysis_options.yaml` file at the root of the package (alongside
    the `pubspec.yaml` file) and `include: package:flutter_lints/flutter.yaml`
    from it.

packages/flutter_lints/pubspec.yaml

@@ -2,7 +2,7 @@ name: flutter_lints
 description: Recommended lints for Flutter apps, packages, and plugins to encourage good coding practices.
 repository: https://github.com/flutter/packages/tree/main/packages/flutter_lints
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+flutter_lints%22
-version: 3.0.0
+version: 3.0.1
 
 environment:
   sdk: ^3.0.0