[Here's a small and simpler updated fork][1]. It adds **only the timeline** link:

    // ==UserScript==
    // @name          Stack Exchange Timeline Link
    // @namespace     stackoverflow
    // @description   Add a 'timeline' link to Stack Exchange / Stack Overflow posts - based on http://stackapps.com/questions/2047/add-timeline-and-revisions-links/4238#4238
    // @include       http://*stackexchange.com/*
    // @include       http://*stackoverflow.com/*
    // @include       http://*serverfault.com/*
    // @include       http://*superuser.com/*
    // @include       http://*askubuntu.com/*
    // @include       http://*mathoverflow.net/*
    // @include       http://*onstartups.com/*
    // @include       http://*nothingtoinstall.com/*
    // @include       http://*seasonedadvice.com/*
    // @include       http://*stackapps.com/*
    // @exclude       http://chat*stackexchange.com/*
    // @exclude       http://chat*stackoverflow.com/*
    // @exclude       http://api*stackexchange.com/*
    // @exclude       http://data*stackexchange.com/*
    // @exclude       */reputation
    // @grant         none
    // ==/UserScript==
        
    (function(){
        var start=function(){
    		$(".post-menu").each(function(){
                id = $(this).find("a.short-link")[0].href.replace(/^.*\/a\//, "").replace(/\/\d+(?:#.*)?$/, "").replace(/\D+/, "");
                rlink = $("<span class='lsep'>|</span><a href='/posts/"+id+"/timeline'>timeline</a>");
                $(this).append(rlink);
            });
        };
    
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.textContent = "(" + start + ")();";
        document.body.appendChild(script);
    })();


  [1]: https://gist.github.com/cauerego/d6382a8952663bb7753f