[fix] request hangs forever for non-responding servers (default timeout would fix this)

## Describe the bug
Superagent hangs if the server is unresponsive and the only way around is setting a timeout.
This might go over many developers heads as a default timeout of 60 seconds is to be expected.

Documentation states it's expected behavior, but this is buried and is unnoticed until you actually use a timeout or have a request get freezing your app if using `await`.

EDIT: It seems that axios has the same behavior, so it could just be me in this case.

**Node.js version:** 12.22.0

**OS version:** Ubuntu 20.04

**Description:**
See above

## Actual behavior

`request.get('tiktok.com');` will never complete

## Expected behavior

should throw a timeout error after 60 seconds if no timeout was set

## Code to reproduce

`request.get('tiktok.com');`

## Checklist

- [x] I have searched through GitHub issues for similar issues.
- [x] I have completely read through the README and documentation.
- [] I have tested my code with the latest version of Node.js and this package and confirmed it is still not working.