Use WHATWG API

> New application code should use the WHATWG API.

src/remote/resolve-user.ts

@@ -1,7 +1,6 @@
 import webFinger from './webfinger';
 import config from '../config';
 import { createPerson, updatePerson } from './activitypub/models/person';
-import { URL } from 'url';
 import { remoteLogger } from './logger';
 import chalk from 'chalk';
 import { User, IRemoteUser } from '../models/entities/user';