add SO_REUSEPORT article

Author: Dane Springmeyer

README.md

@@ -19,4 +19,5 @@ If you are interested in more robust server on top of libuv see [Haywire](https:
 ## TODO
 
  - leverage threadpool
- - sysctl -w net.inet.tcp.msl=1000 on OS X
+ - sysctl -w net.inet.tcp.msl=1000 on OS X
+ - SO_REUSEPORT http://lwn.net/Articles/542629/