chore: update readme

Zekfad · Zekfad · commit 94b3b5c5e24a · 2023-01-23T15:27:52.000+03:00
diff --git a/README.md b/README.md
@@ -1,6 +1,8 @@
 # Fetch API.
 
 > ⚠️ Requires Dart 2.19 or higher.
+>
+> Some methods are exclusive for Dart 3.0, see [compatibility_layer](lib/compatibility_layer.dart) for more info.
 
 This package provides JavaScript bindings to [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
 
