Add Stripe Gameday blog post

Ref #31

@@ -56,6 +56,7 @@ We welcome [suggestions](CONTRIBUTING.md).
 * [The Log: What every software engineer should know about real-time data's unifying abstraction](http://engineering.linkedin.com/distributed-systems/log-what-every-software-engineer-should-know-about-real-time-datas-unifying) (Kreps)
 * [Incident Response at Heroku](https://blog.heroku.com/archives/2014/5/9/incident-response-at-heroku) (McGranaghan)
 * [On HTTP Load Testing](http://www.mnot.net/blog/2011/05/18/http_benchmark_rules) (Nottingham)
+* [Game Day Exercises at Stripe: Learning from `kill -9`](https://stripe.com/blog/game-day-exercises-at-stripe) (Hedlund)
 * [Observability at Twitter](https://blog.twitter.com/2013/observability-at-twitter) (Watson)
 * [Stevey’s Google Platforms Rant](https://plus.google.com/112678702228711889851/posts/eVeouesvaVX) (Yegge)