AUTHORS in ruby-graphviz-0.9.10 vs AUTHORS in ruby-graphviz-0.9.11

@@ -4,9 +4,10 @@
 Miguel Cabrera <http://mfcabrera.com>
 obruening <http://github.com/obruening>
 reactive <http://github.com/reactive>
 Hugh Sasse <[e-mail]>
 axgle <http://github.com/axgle>
+hipe <http://github.com/hipe>
 
 Thanks to :
 
 Desmond Dsouza - Windows tests and corrections