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aims to resolve #36
I was able to determine the issue was, the ref sent by GitHub is to a merge commit which has no parent. CircleCI attempts to check this out by the branch and then fails. This change instead pulls the head of the pull request.
Verification: https://app.circleci.com/pipelines/github/KyleTryon/CircleCI-Metadata-Build?branch=pull%2F9%2Fhead