docs: def default_branch(self, file):
          """ Decide the name of the default branch given the file and the configuration
  
          :param file: File with informations about it
          :return: Branch Name
          """
          if isinstance(self.__default_branch__, str):
              return self.__default_branch__
          elif self.__default_branch__ == GithubProxy.DEFAULT_BRANCH.NO:
              return self.master_upstream
          else:
              return file.sha[:8]