Update minimum Go version (#201)

Go mod version (1.18) is older than depencies (1.20)
- github.com/cilium/ebpf
- github.com/mdlayher/socket

Update `go fmt` for latest Go release.

Signed-off-by: SuperQ <superq@gmail.com>
Co-authored-by: Jeroen Simonetti <jsimonetti@users.noreply.github.com>

doc.go

@@ -17,9 +17,9 @@
 // netlink traffic inside the kernel. Be aware that this might be overwhelming on a system
 // with a lot of netlink traffic.
 //
-//  # modprobe nlmon
-//  # ip link add type nlmon
-//  # ip link set nlmon0 up
+//	# modprobe nlmon
+//	# ip link add type nlmon
+//	# ip link set nlmon0 up
 //
 // At this point use wireshark or tcpdump on the nlmon0 interface to view all netlink traffic.
 //

go.mod

@@ -1,6 +1,6 @@
 module github.com/jsimonetti/rtnetlink
 
-go 1.18
+go 1.20
 
 require (
 	github.com/cilium/ebpf v0.12.3

link.go

@@ -163,10 +163,10 @@ func (l *LinkService) Get(index uint32) (LinkMessage, error) {
 // ref: https://lwn.net/Articles/236919/
 // We explicitly use RTM_NEWLINK to set link attributes instead of
 // RTM_SETLINK because:
-// - using RTM_SETLINK is actually an old rtnetlink API, not supporting most
-//   attributes common today
-// - using RTM_NEWLINK is the prefered way to create AND update links
-// - RTM_NEWLINK is backward compatible to RTM_SETLINK
+//   - using RTM_SETLINK is actually an old rtnetlink API, not supporting most
+//     attributes common today
+//   - using RTM_NEWLINK is the prefered way to create AND update links
+//   - RTM_NEWLINK is backward compatible to RTM_SETLINK
 func (l *LinkService) Set(req *LinkMessage) error {
 	flags := netlink.Request | netlink.Acknowledge
 	_, err := l.c.Execute(req, unix.RTM_NEWLINK, flags)