Add Minbox version 2.0.9

The better way to share your work. The new standard in file sharing. [https://minbox.com](https://minbox.com)



**Question:**
Minbox provides a download link on their website [https://minbox.com/download](https://minbox.com/download). When this link is added as URL and when I run `brew cask install minbox` it returns following:
```bash
$ Error: Uh oh, could not identify primary container for '/Library/Caches/Homebrew/minbox-latest'
```
Is there a option a forget to add or isn't it possible to add referral URLs to `url:`?