Add post link

Author: yaph

README.md

@@ -9,4 +9,5 @@ I moved the blog posts to my website [geeksta.net](https://geeksta.net/). The pr
 * [GitHub in 2013: Pull Request Actors](https://geeksta.net/geeklog/github-pullrequest-actors-2013/)
 * [GitHub in 2013: Fork Events](https://geeksta.net/geeklog/github-fork-events-2013/)
 * [GitHub in 2013: Follow Events](https://geeksta.net/geeklog/github-follow-events-2013/)
+* [GitHub in 2013: Event Types and Commits](https://geeksta.net/geeklog/github-event-types-2013/)
 * [How Complex are TodoMVC Implementations](https://geeksta.net/geeklog/todomvc-complexity/)