Separate git directory support #201
                
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In #200 I highlighted that the library does not support submodules.
This is because in a submodule does not store its .git folder inside the checked out repository, instead .git is a file that has a reference to the actual location of the .git directory.
This is documented here
You can manually reproduce this by doing
git clone --separate-git-dir=/somewhere/else your-repo-urlThis PR adds support for such a set up by detecting that .git is a file instead of a directory and attempting to read the path to the real directory from it.