anchor.diff:  make_url(hooks, {Repo}) ->
       Url = ?GITHUB_API ++ "/repos/~s/hooks",
       io_lib:format(Url, [Repo]);
  +make_url(hooks, {Repo, Id}) ->
  +    Url = ?GITHUB_API ++ "/repos/~s/hooks/~s",
  +    io_lib:format(Url, [Repo, Id]);
  +make_url(collaborators, {Repo}) ->
  +    Url = ?GITHUB_API ++ "/repos/~s/collaborators",
  +    io_lib:format(Url, [Repo]);
   make_url(collaborators, {Repo, Username}) ->
       Url = ?GITHUB_API ++ "/repos/~s/collaborators/~s",
       io_lib:format(Url, [Repo, Username]).
  
positive.code:             {ok, RespBody};
          {ok, "201", _RespHeaders, RespBody} ->
              {ok, RespBody};
          {ok, "302", RespHeaders, _} ->
              RedirectUrl = proplists:get_value("Location", RespHeaders),
              auth_req(Cred, RedirectUrl, Method, Body);
  
negative.code: %% Pull Requests
  -export([
           basic_auth_credentials/0,
           %% Pull Requests
           pull_req_files/3,
           pull_req_comment_line/7,
           pull_req_comments/3,
           %% Users
           user/1,
           repos/2,
           %% Hooks
           hooks/2,
           create_webhook/4,
           delete_webhook/3,
           %% Collaborators
           collaborators/2,
           add_collaborator/3,
           remove_collaborator/3
          ]).
  
  %% Files
  