[235] route list upside down in 0.9.8

I have a pages structure like

pages/
  - shop/
    - index.vue
    - _category.vue

In 0.9.7 routes, it will be generated to

{
	path: "/shop",
	component: _2a02d111,
	name: "shop"
},
{
	path: "/shop/:category?",
	component: _7e4de1c2,
	name: "shop-category"
},

But in 0.9.8, it became upside down