doc: README and CHANGELOG update

Author: Gilles Grousset

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Allow re-using an existing dartanalyzer report with `sonar.dart.analysis.reportPath` (thanks to [Peter Leibiger](https://github.com/kuhnroyal))
 - Add missing dart keywords `extension`, `on`, `mixin` (thanks to [Peter Leibiger](https://github.com/kuhnroyal))
 - Add pedantic 1.9.0 profile (thanks to [Daniel Morawetz](https://github.com/dmorawetz))
+- Faster analysis with 'flutter analyze' and support for different analysis modes with `sonar.flutter.analyzer.mode` (thanks to [Marc Reichelt](https://github.com/mreichelt))
 
 #### Bug Fixes
 

README.md

@@ -69,9 +69,19 @@ sonar.projectVersion=1.0
 # Use commas to specify more than one folder.
 sonar.sources=lib
 sonar.tests=test
-	
+
 # Encoding of the source code. Default is default system encoding.
 sonar.sourceEncoding=UTF-8
+
+# Allows reuse of an existing analyzer report
+# sonar.dart.analysis.reportPath=
+
+# Analyzer mode
+# Can be:
+# - flutter (flutter analyze) - default
+# - dart (dart analyze)
+# - legacy (dartanalyzer)
+# sonar.flutter.analyzer.mode= 
 ```
 
 *For a complete list of available options, please refer to the [SonarQube documentation](https://docs.sonarqube.org/latest/analysis/analysis-parameters/).*