sources:
  "20200131":
    url: "https://github.com/emil-e/rapidcheck/archive/258d907da00a0855f92c963d8f76eef115531716.zip"
    sha256: "87bfbdceaa09e7aaaf70b2efd0078e93323dd8abdad48c57e9f23bfd84174a75"
