Medium: Custom domains don't get redirected from redfin.engineering

Example page demonstrating the problem: https://redfin.engineering/visualize-merge-history-with-git-log-graph-first-parent-and-no-merges-c6a9b5ff109c

I verified that the example from #202 is working, so it seems this is a different problem. Perhaps it's one of the new TLDs being used (`.engineering`) instead of `.com`?