set proper dependency link
set proper dependency link

```
─$ npm install original001/grunt-fontgen --save-dev
npm WARN package.json new_main@0.0.1 No repository field.
npm ERR! fetch failed https://github.com/original001/fontfacegen.git
npm WARN retry will retry, error on last attempt: Error: fetch failed with status code 406
```
milushov/grunt-fontgen