update workflow (#55)

* update workflow

* update documentation

Author: TimHoogstrate

.github/workflows/google_api_availability.yaml

@@ -39,9 +39,9 @@ jobs:
         run: flutter pub get
         working-directory: ${{env.source-directory}}
 
-      # Run Flutter Format to ensure formatting is valid
-      - name: Run Flutter Format
-        run: flutter format --set-exit-if-changed lib
+      # Run dart Format to ensure formatting is valid
+      - name: Run dart Format
+        run: dart format .
         working-directory: ${{env.source-directory}}
 
       # Run Flutter Analyzer