trunk fails to run serf version

[kapilt]

same results with make in the src tree per readme

$ go get -u -v github.com/hasicorp/serf
$ serf version
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x38 pc=0x42a0d8]

goroutine 1 [running]:
runtime.panic(0x7042c0, 0xb09c08)
/home/kapil/projects/go-lang/go/src/pkg/runtime/panic.c:266 +0xb6
github.com/hashicorp/serf/command.(_VersionCommand).Run(0xc210052840, 0xc21000a020, 0x0, 0x0, 0xc210053818)
/home/kapil/src/github.com/hashicorp/serf/command/version.go:33 +0x398
github.com/mitchellh/cli.(_CLI).Run(0xc21004abd0, 0xc21004abd0, 0xc2100638d0, 0xc2100638a0)
/home/kapil/src/github.com/mitchellh/cli/cli.go:69 +0x252
main.realMain(0x401be5)
/home/kapil/src/github.com/hashicorp/serf/main.go:36 +0x2ab
main.main()
/home/kapil/src/github.com/hashicorp/serf/main.go:12 +0x1e

goroutine 3 [syscall]:
os/signal.loop()
/home/kapil/projects/go-lang/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
created by os/signal.init·1
/home/kapil/projects/go-lang/go/src/pkg/os/signal/signal_unix.go:27 +0x31

[mitchellh]

Fixed. Sorry about that.