Bors worker crashes after trying to sync installations

[mboronin]

After I press sync installation for bors, I start seeing a new error popping up in worker crashes.
It is a different repo each time it happens, but it looks like this:

{:timeout,
 {GenServer, :call,
  [
    BorsNG.GitHub,
    {:post_commit_status, {{:installation, 96669}, 6670483},
     {"ec89f3dc80c30951145f62a947cffc0a9f29c4ad", :ok,
      "Build succeeded",
      "<url>"}},
    100000
  ]}}