AUTHORS in ruby-graphviz-0.9.17 vs AUTHORS in ruby-graphviz-0.9.18

- old
+ new

@@ -6,9 +6,11 @@
 reactive <http://github.com/reactive>
 Hugh Sasse <hgs@dmu.ac.uk>
 axgle <http://github.com/axgle>
 hipe <http://github.com/hipe>
 Stefan Huber <http://github.com/MSNexploder>
+Nigel Thorne <http://github.com/NigelThorne>
+Rolf Timmermans <http://github.com/rolftimmermans>
 
 Thanks to :
 
 Desmond Dsouza - Windows tests and corrections
 Vidar Hokstad and Ryan Shea - for nothugly.xsl