old_contents: """
  Ensure builds passed on Travis for current commit.
  
  Because TravisPy is GPLv3 licensed this is a standalone program, the only
  program that includes TravisPy in this repository and therefore only thing in
  repository that is GPLv3 too.
  """
  
  from subprocess import check_output
  from travispy import TravisPy
  
  
  def error(reason):
      """Exit with the given reason printed out."""
      exit("ERROR: " + reason)
  
  
  def main():
      travis = TravisPy()
      revision = check_output(["git", "rev-parse", "HEAD"]).strip()
      build_passed = False
      for build in travis.builds(slug="datawire/mdk"):
          if build.commit.sha == revision + "1":
              if build.passed:
                  build_passed = True
                  break
              else:
                  error("Found the build but it has not passed.\n    Build state: "
                        + build.state +
                        "\n    Build URL: https://travis-ci.org/datawire/mdk/builds/"
                        + str(build.id))
  
      if not build_passed:
          error("No matching build found on Travis CI.")
  
  
  if __name__ == '__main__':
      main()
  
new_contents: """
  Ensure builds passed on Travis for current commit.
  
  Because TravisPy is GPLv3 licensed this is a standalone program, the only
  program that includes TravisPy in this repository and therefore only thing in
  repository that is GPLv3 too.
  """
  
  from subprocess import check_output
  from travispy import TravisPy
  
  
  def error(reason):
      """Exit with the given reason printed out."""
      exit("ERROR: " + reason)
  
  
  def main():
      travis = TravisPy()
      revision = check_output(["git", "rev-parse", "HEAD"]).strip()
      build_passed = False
      for build in travis.builds(slug="datawire/mdk"):
          if build.commit.sha == revision:
              if build.passed:
                  build_passed = True
                  break
              else:
                  error("Found the build but it has not passed.\n    Build state: "
                        + build.state +
                        "\n    Build URL: https://travis-ci.org/datawire/mdk/builds/"
                        + str(build.id))
  
      if not build_passed:
          error("No matching build found on Travis CI.")
  
  
  if __name__ == '__main__':
      main()
  
subject: Remove breaking change.