doc: add flutter favorite badge

Author: dkrutskikh

README.md

@@ -30,6 +30,12 @@ Dart Code Metrics is a static analysis tool that helps you analyse and improve y
 - Checks [unused l10n](https://dartcodemetrics.dev/docs/cli/check-unused-l10n)
 - Can be used as [CLI](https://dartcodemetrics.dev/docs/cli/overview), [analyzer plugin](https://dartcodemetrics.dev/docs/analyzer-plugin) or [library](https://dartcodemetrics.dev/docs/getting-started/installation#library)
 
+<img
+  src="https://github.com/raw/dart-code-checker/dart-code-metrics/flutter-favorite/assets/flutter-favorite-badge-1200px"
+  alt="Flutter Favorite Badge"
+  height="120" width="120"
+  align="right">
+
 ## Links
 
 - See [CHANGELOG.md](./CHANGELOG.md) for major/breaking updates, and [releases](https://github.com/dart-code-checker/dart-code-metrics/releases) for a detailed version history.

analysis_options.yaml

@@ -157,6 +157,7 @@ linter:
     - type_annotate_public_apis
     - unawaited_futures
     - unnecessary_await_in_return
+    - unnecessary_constructor_name
     #    - unnecessary_final
     - unnecessary_lambdas
     - unnecessary_null_aware_assignments