bump lints dep and fix (#275)

Author: kevmoo

example/arg_parser/example.dart

@@ -5,7 +5,7 @@
 /// This is an example of converting the args in test.dart to use this API.
 /// It shows what it looks like to build an [ArgParser] and then, when the code
 /// is run, demonstrates what the generated usage text looks like.
-library example;
+library;
 
 import 'dart:io';
 

pubspec.yaml

@@ -12,5 +12,5 @@ environment:
   sdk: ^3.3.0
 
 dev_dependencies:
-  dart_flutter_team_lints: ^2.0.0
+  dart_flutter_team_lints: ^3.0.0
   test: ^1.16.0