updated project style guidelines

lib/main.dart

@@ -41,16 +41,14 @@ Future<void> main() async {
     log('Error initializing Firebase app!');
   }
 
-  ByteData data = await PlatformAssetBundle().load('assets/ca/lets-encrypt-r3.pem');
+  var data = await PlatformAssetBundle().load('assets/ca/lets-encrypt-r3.pem');
   SecurityContext.defaultContext.setTrustedCertificatesBytes(data.buffer.asUint8List());
 
   if(kReleaseMode) {
-    ErrorWidget.builder = (error) {
-      return PlaceholderView(
+    ErrorWidget.builder = (error) => PlaceholderView(
         icon: Icons.phonelink_erase_rounded,
         text: error.toStringShort(),
       );
-    };
   }
 
   runApp(
@@ -101,8 +99,7 @@ class _MainState extends State<Main> {
   }
 
   @override
-  Widget build(BuildContext context) {
-    return Directionality(
+  Widget build(BuildContext context) => Directionality(
       textDirection: TextDirection.ltr,
       child: Consumer<SettingsProvider>(
         builder: (context, settings, child) {
@@ -146,7 +143,6 @@ class _MainState extends State<Main> {
         },
       ),
     );
-  }
 
   @override
   void dispose() {