fix: printing of result when interrupted

[cdscih]

Hello,

I just noticed that whenever I forcefully (CTRL-C) interrupt the execution of this script

'use strict'

const autocannon = require('autocannon')

const instance = autocannon({
  url: 'http://localhost:3000'
})

// this is used to kill the instance on CTRL-C
process.once('SIGINT', () => {
  instance.stop()
})

// just render results
autocannon.track(instance, {renderProgressBar: false})

the log in the console is a little broken because the first row isn't being written on a new line.

Example:

^C┌─────────┬──────┬──────┬───────┬──────┬────────┬─────────┬────────┐
│ Stat    │ 2.5% │ 50%  │ 97.5% │ 99%  │ Avg    │ Stdev   │ Max    │
├─────────┼──────┼──────┼───────┼──────┼────────┼─────────┼────────┤
│ Latency │ 1 ms │ 2 ms │ 5 ms  │ 7 ms │ 2.2 ms │ 5.52 ms │ 230 ms │
└─────────┴──────┴──────┴───────┴──────┴────────┴─────────┴────────┘
┌───────────┬────────┬────────┬────────┬────────┬────────┬────────┬────────┐
│ Stat      │ 1%     │ 2.5%   │ 50%    │ 97.5%  │ Avg    │ Stdev  │ Min    │
├───────────┼────────┼────────┼────────┼────────┼────────┼────────┼────────┤
│ Req/Sec   │ 2657   │ 2657   │ 3905   │ 4055   │ 3660.5 │ 582.09 │ 2657   │
├───────────┼────────┼────────┼────────┼────────┼────────┼────────┼────────┤
│ Bytes/Sec │ 497 kB │ 497 kB │ 730 kB │ 758 kB │ 684 kB │ 109 kB │ 497 kB │
└───────────┴────────┴────────┴────────┴────────┴────────┴────────┴────────┘

Req/Bytes counts sampled once per second.
# of samples: 4

15k requests in 4.03s, 2.74 MB read

I thought this fix could make sense for all use cases so I decided to just send a pull request to fix it globally.

ps. This is my first pull request ever. Hope I'm not doing anything wrong! 🙈

[mcollina]

lgtm

[cdscih]

I think i fixed the failing tests btw. Do I need to do something else to close this?

[mcollina]

Still lgtm