Adapt to new download URL for Git for Windows

The downloads for Git for Windows are now hosted on GitHub.

Because of that reason your Git packages stayed at 1.9.0 and didn’t update to 1.9.2.

Please remember to switch to the [new repository](https://github.com/tomone/chocolatey-packages-ferventcoder) as soon as possible, otherwise it will get messy with fixes like this one.

Related issue: https://github.com/ferventcoder/chocolateyautomaticpackages/issues/78

As soon as you merge this, I’ll integrate it into the new repository.