Update README.md (#55)
[!IMPORTANT]
This repo has moved to https://github.com/dart-lang/core/tree/main/pkgs/platform
A generic platform abstraction for Dart.
Like dart:io, package:platform supplies a rich, Dart-idiomatic API for accessing platform-specific information.
package:platform provides a lightweight wrapper around the static Platform properties that exist in dart:io. However, it uses instance properties rather than static properties, making it possible to mock out in tests.