Support git repository checkouts using git worktree
#5
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When working with repository code using git worktree, the worktree's .git is a file that references the location of the worktree's git files. This location (i.e., directory) only contains pertinent data for that worktree. In addition, it has a file called commondir that specifies the location of the rest of the repository files.
This PR updates git-descrive-semver to identify whether the current worktree uses the commondir mechanism. If so, it enables support for this mechanism in go-git.