Add myself to contributors

Christopher Lee · ask · commit 8a802d2dfb3e · 2013-08-31T14:14:43.000+01:00
diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
@@ -140,3 +140,4 @@ Oleg Anashkin, 2013/06/27
 Ross Lawley, 2013/07/05
 Alain Masiero, 2013/08/07
 Adrien Guinet, 2013/08/14
+Christopher Lee, 2013/08/29
