trailing commas

Author: sigurdm

test/pubspec_test.dart

@@ -323,7 +323,7 @@ dependencies:
       expectPubspecException('version: 2.1', (pubspec) => pubspec.version,
           expectedContains:
               '"version" field must have three numeric components: major, minor, '
-              'and patch. Instead of "2.1", consider "2.1.0"');
+              'and patch. Instead of "2.1", consider "2.1.0"',);
     });
 
     test('throws if version is malformed (looking like an int)', () {