Merge pull request OAI#206 from dret/patch-2

updating status code information

Author: webron

versions/2.0.md

@@ -43,7 +43,7 @@ Some examples of possible mime type definitions:
   application/vnd.github.v3.patch
 ```
 ##### <a name="httpCodes"/>HTTP Status Codes
-The HTTP Status Codes are used to indicate the status of the executed operation. The available status codes are described by [RFC 2616](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html).
+The HTTP Status Codes are used to indicate the status of the executed operation. The available status codes are described by [RFC 7231](http://tools.ietf.org/html/rfc7231#section-6) and in the [IANA Status Code Registry](http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml).
 
 ## Specification