Add getMiddleware function to Route class (dingo#1537)

* Add getMiddleware function to Route class

The getMiddleware function is missing and reported here: flipboxstudio/lumen-generator#25
Also I think you have to be able to query the middlewares.

If the function is not necessary and you can query the middlewares with another method, please write it in the comments.

* Fix style

* Fix style

Author: gazben

src/Routing/Route.php

@@ -533,4 +533,14 @@ public function secure()
     {
         return in_array('https', $this->action, true);
     }
+
+    /**
+     * Return the middlewares for this route.
+     *
+     * @return array
+     */
+    public function getMiddleware()
+    {
+        return $this->middleware;
+    }
 }