Update README.md

Mention another alternative
Yelp · Nov 14, 2016 · 3143ca6 · 3143ca6
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@@ -252,6 +252,7 @@ your machine.
 * [Docker and the PID 1 zombie reaping problem (Phusion Blog)](https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/)
 * [Trapping signals in Docker containers (@gchudnov)](https://medium.com/@gchudnov/trapping-signals-in-docker-containers-7a57fdda7d86)
 * [tini](https://github.com/krallin/tini), an alternative to dumb-init
+* [pid1](https://github.com/fpco/pid1), an alternative to dumb-init, written in Haskell
 
 
 [daemontools]: http://cr.yp.to/daemontools.html