$ git rev-parse HEAD
aa636603a7179e83d5a3dca7083ff8dd01e2c2a8
$ go build
go: downloading github.com/mattn/go-runewidth v0.0.9
go: downloading github.com/nsf/termbox-go v0.0.0-20200418040025-38ba6e5628f1
go: downloading golang.org/x/sys v0.0.0-20200918174421-af09f7315aff
client.go:36:2: no required module provides package golang.org/x/net/icmp; to add it:
	go get golang.org/x/net/icmp
client.go:37:2: no required module provides package golang.org/x/net/ipv4; to add it:
	go get golang.org/x/net/ipv4
client.go:38:2: no required module provides package golang.org/x/net/ipv6; to add it:
	go get golang.org/x/net/ipv6