TimeoutError: Navigation Timeout Exceeded when Using Puppeteer headless

It seems that when I'm trying to use the headless feature, i.e.

```jsonc
// backstop.json
{
"debug": false,
"debugWindow": false
}
```
and use the `puppeteer` engine
```jsonc
// backstop.json
{
"engine": "puppeteer"
}
```

I always get the `TimeoutError`.

When using `Chromy`, same thing also happens when using the headless version.

I'm not using docker (the portion in the official documentation is irrelevant).
I'm just running the `backstop` for my React application.

I'm using the currently latest Chrome (version`72.0.3626.121`) and Backstopjs latest release (version `v3.8.8`)

I also try to set the `asyncCaptureLimit` and `asyncCompareLimit` to 1
```jsonc
// backstop.json
{
"asyncCaptureLimit": 1,
"asyncCompareLimit": 1,
}
```
But, still no luck! Any ideas?