add Vol.mol (#1538)

add Vol.moe
![image](https://user-images.githubusercontent.com/16996753/52684793-69469c80-2f82-11e9-9a67-7b47ef79879f.png)

lib/router.js

@@ -868,6 +868,8 @@ router.get('/tencentvideo/playlist/:id', require('./routes/tencent/video/playlis
 router.get('/manhuagui/comic/:id', require('./routes/manhuagui/comic'));
 // 動漫狂
 router.get('/cartoonmad/comic/:id', require('./routes/cartoonmad/comic'));
+// Vol
+router.get('/vol/:mode?', require('./routes/vol/lastupdate'));
 
 // Tits Guru
 router.get('/tits-guru/home', require('./routes/titsguru/home'));