Figure out why it takes two SIGINTs to fully exit a process

```sh
go run cmd/react/main.go
| Listening on http://0.0.0.0:3000
^C^Csignal: interrupt
```

vs. removing signals

```go
cli := cli.New("react", "react development server").Signals(nil)
```

```sh
 go run cmd/react/main.go
| Listening on http://0.0.0.0:3000
^Csignal: interrupt
```