Merge pull request #2 from kotakanbe/patch-1

update README.md
diff --git a/README.md b/README.md
index 943fac5..8205f5e 100644
--- a/README.md
+++ b/README.md
@@ -56,8 +56,9 @@
   subcommands.Register(subcommands.HelpCommand(), "")
   subcommands.Register(subcommands.FlagsCommand(), "")
   subcommands.Register(subcommands.CommandsCommand(), "")
-  subcommands.Register(&print{}, "")
+  subcommands.Register(&printCmd{}, "")
 
+  flag.Parse()
   ctx := context.Background()
   os.Exit(int(subcommands.Execute(ctx)))
 }