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fix(git): support git packed refs --all mode (#77)

* test: git-pack-refs vs gitHead

also, let's have gitHead tests for both refs-packed and non-packed modes

re https://github.com/npm/read-package-json/issues/76 (git packed refs --all mode not supported)

* Fall back to .git/packed-refs if .git/<ref> does not exist

* refactor: minor

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