Work on #61: Add support for ICMP

+ Update dependencies

vendor/github.com/go-ping/ping/README.md

@@ -0,0 +1,130 @@
+# go-ping
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/go-ping/ping)](https://pkg.go.dev/github.com/go-ping/ping)
+[![Circle CI](https://circleci.com/gh/go-ping/ping.svg?style=svg)](https://circleci.com/gh/go-ping/ping)
+
+A simple but powerful ICMP echo (ping) library for Go, inspired by
+[go-fastping](https://github.com/tatsushid/go-fastping).
+
+Here is a very simple example that sends and receives three packets:
+
+```go
+pinger, err := ping.NewPinger("www.google.com")
+if err != nil {
+	panic(err)
+}
+pinger.Count = 3
+err = pinger.Run() // Blocks until finished.
+if err != nil {
+	panic(err)
+}
+stats := pinger.Statistics() // get send/receive/rtt stats
+```
+
+Here is an example that emulates the traditional UNIX ping command:
+
+```go
+pinger, err := ping.NewPinger("www.google.com")
+if err != nil {
+	panic(err)
+}
+
+// Listen for Ctrl-C.
+c := make(chan os.Signal, 1)
+signal.Notify(c, os.Interrupt)
+go func() {
+	for _ = range c {
+		pinger.Stop()
+	}
+}()
+
+pinger.OnRecv = func(pkt *ping.Packet) {
+	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v\n",
+		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt)
+}
+
+pinger.OnFinish = func(stats *ping.Statistics) {
+	fmt.Printf("\n--- %s ping statistics ---\n", stats.Addr)
+	fmt.Printf("%d packets transmitted, %d packets received, %v%% packet loss\n",
+		stats.PacketsSent, stats.PacketsRecv, stats.PacketLoss)
+	fmt.Printf("round-trip min/avg/max/stddev = %v/%v/%v/%v\n",
+		stats.MinRtt, stats.AvgRtt, stats.MaxRtt, stats.StdDevRtt)
+}
+
+fmt.Printf("PING %s (%s):\n", pinger.Addr(), pinger.IPAddr())
+err = pinger.Run()
+if err != nil {
+	panic(err)
+}
+```
+
+It sends ICMP Echo Request packet(s) and waits for an Echo Reply in
+response. If it receives a response, it calls the `OnRecv` callback.
+When it's finished, it calls the `OnFinish` callback.
+
+For a full ping example, see
+[cmd/ping/ping.go](https://github.com/go-ping/ping/blob/master/cmd/ping/ping.go).
+
+## Installation
+
+```
+go get -u github.com/go-ping/ping
+```
+
+To install the native Go ping executable:
+
+```bash
+go get -u github.com/go-ping/ping/...
+$GOPATH/bin/ping
+```
+
+## Supported Operating Systems
+
+### Linux
+This library attempts to send an "unprivileged" ping via UDP. On Linux,
+this must be enabled with the following sysctl command:
+
+```
+sudo sysctl -w net.ipv4.ping_group_range="0 2147483647"
+```
+
+If you do not wish to do this, you can call `pinger.SetPrivileged(true)`
+in your code and then use setcap on your binary to allow it to bind to
+raw sockets (or just run it as root):
+
+```
+setcap cap_net_raw=+ep /path/to/your/compiled/binary
+```
+
+See [this blog](https://sturmflut.github.io/linux/ubuntu/2015/01/17/unprivileged-icmp-sockets-on-linux/)
+and the Go [x/net/icmp](https://godoc.org/golang.org/x/net/icmp) package
+for more details.
+
+### Windows
+
+You must use `pinger.SetPrivileged(true)`, otherwise you will receive
+the following error:
+
+```
+socket: The requested protocol has not been configured into the system, or no implementation for it exists.
+```
+
+Despite the method name, this should work without the need to elevate
+privileges and has been tested on Windows 10. Please note that accessing
+packet TTL values is not supported due to limitations in the Go
+x/net/ipv4 and x/net/ipv6 packages.
+
+### Plan 9 from Bell Labs
+
+There is no support for Plan 9. This is because the entire `x/net/ipv4` 
+and `x/net/ipv6` packages are not implemented by the Go programming 
+language.
+
+## Maintainers and Getting Help:
+
+This repo was originally in the personal account of
+[sparrc](https://github.com/sparrc), but is now maintained by the
+[go-ping organization](https://github.com/go-ping).
+
+For support and help, you usually find us in the #go-ping channel of
+Gophers Slack. See https://invite.slack.golangbridge.org/ for an invite
+to the Gophers Slack org.