CONTRIBUTORS in activemerchant-1.47.0 vs CONTRIBUTORS in activemerchant-1.48.0

@@ -516,5 +516,21 @@
 
 QuickBooks Payments (January 2015)
 
 * Arbab Ahmed (bizla)
 * Ivan Sanchez (ivanfer)
+
+Axcess MS (February 2015)
+
+* Tim Tait (timtait)
+
+PayHub (February 2015)
+
+* Grep Ruby (grepruby)
+
+Qvalent (March 2015)
+
+* Mark Bennett (markabe)
+
+Worldpay Online Payments (April 2015)
+
+* (ao)