handleResponse uses resolve for both good and bad responses

[rcjsuen]

The current implementation has resolve called on a string for both good and bad responses. This is a little confusing and can make it difficult to determine if an error has happened or not.

maildove/src/maildove.ts

Lines 252 to 258 in c5a8dbb

	this.queue.length = 0;
	this.sock.removeAllListeners('close');
	this.sock.removeAllListeners('end');
	resolve(domain);
	return;

maildove/src/maildove.ts

Lines 303 to 308 in c5a8dbb

	default:
	if (code >= smtpCodes.NegativeCompletion) {
	console.error('SMTP server responds with error code', code);
	this.sock.end();
	resolve(`SMTP server responded with code: ${code} + ${msg}`);
	}