docs: def remove(self, repo):
          """Remove custom repository
          """
          rem_repo = False
          with open(self.custom_repo_file, "w") as repos:
              for line in self.custom_repositories_list.splitlines():
                  repo_name = line.split()[0]
                  if repo_name != repo:
                      repos.write(line + "\n")
                  else:
                      print("\nRepository '{0}' successfully "
                            "removed\n".format(repo))
                      rem_repo = True
              repos.close()
          if not rem_repo:
              print("\nRepository '{0}' doesn't exist\n".format(repo))
          raise SystemExit()