def setup(session, token):
   """
   Set session - set token into request header.
   
   :param: ``session`` Session for comunication with GitHub
   :param: ``token``  Set token to header Authentization
   :return: ``session``
   """
   session.headers = {'User-Agent': 'Python'}
   def token_auth(req):
      req.headers['Authorization'] = 'token ' + token
      return req

   session.auth = token_auth
   
   return session