add rod's blog post

Author: calvinmetcalf

README.md

@@ -16,7 +16,7 @@ This package is a mirror of the Streams2 and Streams3 implementations in
 Node-core.
 
 If you want to guarantee a stable streams base, regardless of what version of
-Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core.
+Node you, or the users of your libraries are using, use **readable-stream** *only* and avoid the *"stream"* module in Node-core, for background see [this blogpost](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).
 
 As of version 2.0.0 **readable-stream** uses semantic versioning.