added keygenPromise

[misogihagi]

#21
and merged #13

[micalevisk]

I've added this feature in my fork: https://www.npmjs.com/package/@micalevisk/ssh-keygen

You just need to supress the second parameter to make it return a Promise instead.

async function runPromiseVersion() {
  try {
    const out = await keygen({
      comment: 'john@doe.com',
      read: true,
    });

    console.log('Done generating key pairs');
    console.log(out.key);
    console.log(out.pubKey);
  } catch (err) {
    console.log('There was a problem:', err);
  }
}