Fixes pipeline API

gin.go

@@ -71,6 +71,7 @@ func New() *Engine {
 		RouterGroup: RouterGroup{
 			Handlers: nil,
 			BasePath: "/",
+			root:     true,
 		},
 		RedirectTrailingSlash:  true,
 		RedirectFixedPath:      false,
@@ -133,10 +134,11 @@ func (engine *Engine) NoMethod(handlers ...HandlerFunc) {
 // Attachs a global middleware to the router. ie. the middlewares attached though Use() will be
 // included in the handlers chain for every single request. Even 404, 405, static files...
 // For example, this is the right place for a logger or error management middleware.
-func (engine *Engine) Use(middlewares ...HandlerFunc) {
+func (engine *Engine) Use(middlewares ...HandlerFunc) routesInterface {
 	engine.RouterGroup.Use(middlewares...)
 	engine.rebuild404Handlers()
 	engine.rebuild405Handlers()
+	return engine
 }
 
 func (engine *Engine) rebuild404Handlers() {