CONTRIBUTORS in activemerchant-1.32.1 vs CONTRIBUTORS in activemerchant-1.33.0

@@ -390,5 +390,13 @@
 * Alex Dunae (alexdunae)
 
 Finansbank WebPOS (March 2013)
 
 * scamurcuoglu
+
+Cardstream Modern (March 2013)
+
+* Vincens (ExxKA)
+
+Transnational (May 2013)
+
+* Ben VandenBos (bvandenbos)