code: def make_auth_headers():
      
      if not os.path.exists(".appveyor.token"):
          raise RuntimeError(
              "Please create a file named `.appveyor.token` in the current directory. "
              "You can get the token from https://ci.appveyor.com/api-token"
          )
      with open(".appveyor.token") as f:
          token = f.read().strip()
  
      headers = {
          'Authorization': 'Bearer {}'.format(token),
      }
      return headers
docs: Make the authentication headers needed to use the Appveyor API.