Correcting URL syntax in markdown.

README.md

@@ -20,11 +20,12 @@ think about writing something for emacs, then have a quick hunt and
 find something that already does the job.  This time I followed
 through to completion (I was stuck in an airport), but if you're after
 an alternative then when I did go looking I found:
-[http://www.emacswiki.org/emacs/EtagsStack]().  I'd like to think that
-this offers something a little bit different; it supports gtags as
-well as etags out of the box and in theory at least can be extended to
-others, and it offers a few more operations on the chronological
-trace.  Of course, if you need any of that is up to you :)
+[http://www.emacswiki.org/emacs/EtagsStack](http://www.emacswiki.org/emacs/EtagsStack).
+I'd like to think that this offers something a little bit different;
+it supports gtags as well as etags out of the box and in theory at
+least can be extended to others, and it offers a few more operations
+on the chronological trace.  Of course, if you need any of that is up
+to you :)
 
 The functionality and interface is inspired by browse-kill-ring (and
 in fact, I borrowed the navigation code from that package).