The readme says that flutter create with version 2.xx adds flutter_lints to the project.
This seems like every version since 2 includes flutter_lints.

But the latest stable (2.2.2) doesn't include it.
The beta channel (2.3.0-24.1.pre) includes it.

Changing the readme to 2.3.0 seems like a good option.

Closes flutter/flutter#85378

Pre-launch Checklist

• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide.
• I listed at least one issue that this PR fixes in the description above.
• I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
• I updated CHANGELOG.md to add a description of the change.
• I updated/added relevant documentation (doc comments with ///).
• I signed the CLA.
• All existing and new tests are passing.