Break line present at the end

I'm using `get-sdtdin` at [regexgen-cli](https://github.com/Kikobeats/regexgen-cli) and I noticed that an `\n` is always present at the final of the input:

```js
getStdin().then(stdin => {
  console.log(stdin)
  console.log([].concat(stdin))
})
```

```bash
❯ echo hola | regexgen
hola

[ 'hola\n' ]
```