Submodules should use https instead of ssh

[IceReaper]

Cloning the submodules only works if you have a local ssh key which is added to your github account. Otherwise the submodules cannot be cloned due to an access denied error. As these repositories are public, using https sources will fix this problem.

[Therzok]

url = ../../owner/repo.git will use the same protocol as the main clone.

[utekai]

Yes, I complained about that at some point a long, long time ago ... but then installed a local ssh key.

@Therzok Can you show the full command?

Here's the command I used. https://github.com/xamarin/urho.git --recursive