pkg/watcher: prepare for 0.9.3

pkg/watcher/test/ready/mac_os_test.dart

Index: pkg/watcher/test/ready/mac_os_test.dart
diff --git a/pkg/watcher/test/ready/mac_os_test.dart b/pkg/watcher/test/ready/mac_os_test.dart
index e0275c4ee2262bda6c6eb514c6a84d3694d7bf34..721d3e7a06de07d4275c516e1b4bc1101d418d4a 100644
--- a/pkg/watcher/test/ready/mac_os_test.dart
+++ b/pkg/watcher/test/ready/mac_os_test.dart
@@ -4,12 +4,11 @@
 
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:watcher/src/directory_watcher/mac_os.dart';
-import 'package:watcher/watcher.dart';
 
 import 'shared.dart';
 import '../utils.dart';
 
-main() {
+void main() {
   initConfig();
 
   watcherFactory = (dir) => new MacOSDirectoryWatcher(dir);
@@ -17,4 +16,4 @@ main() {
   setUp(createSandbox);
 
   sharedTests();
-}
+}