TODO: Update with ref. to issue #20

Closes #20

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

TODO.md

@@ -1,9 +1,11 @@
 LibuEv TODO
 ===========
 
-* Add standard UNIX backend with select() and timer_create()
-  See SMCRoute and toolbox for examples.
-* Port to *BSD kqueue API, http://en.wikipedia.org/wiki/Kqueue
+* Add standard UNIX backend with `select()` and `timer_create()`
+  See SMCRoute and toolbox for examples
+* Port to *BSD kqueue API, <http://en.wikipedia.org/wiki/Kqueue>
   Also in UNIX Network Progamming, by W. Richard Stevens 3rd ed.
+  More porting ideas and help, see the following GitHub issue;
+  <https://github.com/troglobit/libuev/issues/20>
 * Restore Lua bindings now that libuEv itself has stabilized