Fix broken link in Readme (#679)

Fix broken link in Readme

Author: titoBouzout

README.md

@@ -271,7 +271,7 @@ When encountering an error, Multer will delegate the error to Express. You can
 display a nice error page using [the standard express way](http://expressjs.com/guide/error-handling.html).
 
 If you want to catch errors specifically from Multer, you can call the
-middleware function by yourself. Also, if you want to catch only [the Multer errors](https://github.com/expressjs/multer/blob/master/lib/make-error.js#L1-L9), you can use the `MulterError` class that is attached to the `multer` object itself (e.g. `err instanceof multer.MulterError`).
+middleware function by yourself. Also, if you want to catch only [the Multer errors](https://github.com/expressjs/multer/blob/master/lib/multer-error.js), you can use the `MulterError` class that is attached to the `multer` object itself (e.g. `err instanceof multer.MulterError`).
 
 ```javascript
 var multer = require('multer')