Update readme to indicate why you might use WhatFailureGroupHandler

README.mdown

@@ -182,6 +182,10 @@ Handlers
    to the wrapped handler.
 - _TestHandler_: Used for testing, it records everything that is sent to it and
   has accessors to read out the information.
+- _WhatFailureGroupHandler_: This handle extends the _GroupHandler_ ignoring
+   exceptions raised by each child handler. This allows you to ignore issues
+   where a remote tcp connection may have died but you do not want your entire
+   application to crash and may wish to continue to log to other handlers.
 
 Formatters
 ----------