Identifies and matches git+ssh scheme remotes

Evanrequested to merge
xaocon/git-lab-rust:git+ssh into master

Remotes like git+ssh://host/path/to.git are valid but aren't handed out by gitlab (at least not anymore). This adds logic to convert such a remote to the ssh type gitlab would hand out. Tested on a number of repos on my machine. No tests that passed on my system without the changes fail now.

Fixes #65

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