Expand phone number range for Kazakhstan (#59)

Author: jeffyanta

pkg/code/antispam/phone.go

@@ -6,7 +6,7 @@ import "strings"
 // todo: Needs tests
 func hasBannedPhoneNumberPrefix(phoneNumber string) bool {
 	// Check that a +7 phone number is not a mobile number from Kazakhstan
-	if strings.HasPrefix(phoneNumber, "+770") || strings.HasPrefix(phoneNumber, "+777") {
+	if strings.HasPrefix(phoneNumber, "+76") || strings.HasPrefix(phoneNumber, "+77") {
 		return false
 	}