anchor.diff:  make_url(teams_repos, {TeamId, RepoFullName}) ->
       Url = ?GITHUB_API ++ "/teams/~p/repos/~s",
       io_lib:format(Url, [TeamId, RepoFullName]);
  +make_url(team_membership, {TeamId, Username}) ->
  +    Url = ?GITHUB_API ++ "/teams/~p/membership/~s",
  +    io_lib:format(Url, [TeamId, Username]);
   
   %% Repositories
   make_url(repo, {RepoFullName}) ->
  
positive.code:             Error
      end.
  
  %% Hooks
  
  -spec hooks(credentials(), repository()) -> result().
  
negative.code:          add_team_repository/3,
           add_team_member/3,
           delete_team_member/3,
           team_membership/3,
           %% Hooks
           hooks/2,
           create_webhook/4,
  