增加马良行 https://www.mlhang.com/ RSS (#1959)

测试结果：
![image](https://user-images.githubusercontent.com/15406392/56430300-8a1bcd00-62f8-11e9-8c91-e8823930855f.png)

Close [#1937](https://github.com/DIYgod/RSSHub/issues/1937)

lib/router.js

@@ -1271,4 +1271,7 @@ router.get('/1point3acres/user/:id/posts', require('./routes/1point3acres/posts'
 // 广东海洋大学
 router.get('/gdoujwc', require('./routes/universities/gdou/jwc/jwtz'));
 
+// 马良行
+router.get('/mlhang', require('./routes/mlhang/latest'));
+
 module.exports = router;