Add generated help and version commands

app.go

@@ -34,6 +34,9 @@ func New(identity Identity, commands ...Command) (*App, error) {
 			},
 		},
 	}
+	if err := app.installBuiltins(); err != nil {
+		return nil, err
+	}
 	if err := app.Register(commands...); err != nil {
 		return nil, err
 	}