Update CONTRIBUTORS.txt

CONTRIBUTORS.txt

@@ -196,3 +196,4 @@ Piotr Maślanka, 2015/08/24
 Gerald Manipon, 2015/10/19
 Krzysztof Bujniewicz, 2015/10/21
 Sukrit Khera, 2015/10/26
+Dave Smith, 2015/10/27