fixes for changelog

CHANGELOG.md

@@ -17,7 +17,7 @@ The change to use the `integration_test` package is a fundamentally different ap
   - build_runner
   - flutter_gherkin
 2. Add the following `build.yaml` to the root of your project. This file allows the dart code generator to target files outside of your application's `lib` folder
-```
+```yaml
 targets:
   $default:
     sources:
@@ -75,12 +75,12 @@ void main() {
           ..setWriteFn(print),
         TestRunSummaryReporter()
           ..setWriteLineFn(print)
-          ..setWriteFn(print),,
+          ..setWriteFn(print),
         JsonReporter(
           writeReport: (_, __) => Future<void>.value(),
         ),
       ],
-    (World world) => app.main,
+    (World world) => app.main(),
   );
 }
 ```