vendor: Bump github.com/AudriusButkevicius/go-nat-pmp

vendor/github.com/AudriusButkevicius/go-nat-pmp/natpmp.go

@@ -4,8 +4,6 @@ import (
 	"fmt"
 	"net"
 	"time"
-
-	"github.com/jackpal/gateway"
 )
 
 // Implement the NAT-PMP protocol, typically supported by Apple routers and open source
@@ -34,17 +32,6 @@ func NewClient(gateway net.IP, timeout time.Duration) (nat *Client) {
 	return &Client{gateway, timeout}
 }
 
-// Create a NAT-PMP client for the NAT-PMP server at the default gateway.
-func NewClientForDefaultGateway(timeout time.Duration) (nat *Client, err error) {
-	var g net.IP
-	g, err = gateway.DiscoverGateway()
-	if err != nil {
-		return
-	}
-	nat = NewClient(g, timeout)
-	return
-}
-
 // Results of the NAT-PMP GetExternalAddress operation
 type GetExternalAddressResult struct {
 	SecondsSinceStartOfEpoc uint32