Merge pull request #39 from fluidpay/develop

Develop

payment.go

@@ -17,7 +17,7 @@ var (
 var (
 	amexCardFormatString                = "^3[47][0-9]{13}$"
 	visaCardFormatString                = "^4[0-9]{15}$"
-	mastercardCardFormatString          = "^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$"
+	mastercardCardFormatString          = "^(?:5[1-9][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$"
 	discoverCardFormatString            = "^65[0-9]{14,17}|64[4-9][0-9]{13,16}|6011[0-9]{12,15}|(622(?:12[6-9]|1[3-9][0-9]|[2-8][0-9][0-9]|9[01][0-9]|92[0-5])[0-9]{10,13})$"
 	jcbCardFormatString                 = "^(?:2131|1800|35[0-9]{2})[0-9]{12,15}$"
 	dinersClubInternationalFormatString = "^3(?:0[0-5]|[68][0-9])[0-9]{11,16}$"