middleware stacking bug fix

stack.go

@@ -3,7 +3,7 @@ package mux
 import "net/http"
 
 // stack middlewares(http handler) in order they are passed (FIFO)
-func stack(middlewares []func(http.Handler) http.Handler, endpoint http.Handler) http.Handler {
+func stack(endpoint http.Handler, middlewares []func(http.Handler) http.Handler) http.Handler {
 	// Return ahead of time if there aren't any middlewares for the chain
 	if len(middlewares) == 0 {
 		return endpoint