rand dart fix

deprecated/flutter_cli/test/project_model_test.dart

@@ -108,7 +108,7 @@ var _pubSpec = ['name: a'];
 
 class FileReaderMock implements FileReader {
   @override
-  List<String> readAsLines(String filePath, {Encoding encoding: utf8}) {
+  List<String> readAsLines(String filePath, {Encoding encoding = utf8}) {
     if (filePath == '.packages') {
       return _dotPackages;
     } else if (filePath == 'pubspec.yaml') {
@@ -118,7 +118,7 @@ class FileReaderMock implements FileReader {
   }
 
   @override
-  String readAsString(String filePath, {Encoding encoding: utf8}) {
+  String readAsString(String filePath, {Encoding encoding = utf8}) {
     for (var file in _files) {
       if (file['path'] == filePath) return file['content'];
     }