Without the version variable the homebrew doesn't detect the version.
```
$ brew info django-completion
django-completion: stable bash, HEAD
https://github.com/django/django
/usr/local/Cellar/django-completion/1.6.2 (2 files, 8.0K) *
  Built from source
From: https://github.com/homebrew/homebrew-completions/commits/master/django-completion.rb
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
```