fix typo

index.js

@@ -292,7 +292,7 @@ Router.prototype._on = function _on (method, path, opts, handler, store) {
   currentNode.addRoute(route, this.constrainer)
 }
 
-Router.prototype.hasRoute = function has (method, path, constraints) {
+Router.prototype.hasRoute = function hasRoute (method, path, constraints) {
   const route = this._findRoute(method, path, constraints)
   return route !== null
 }