fix(typings): allow port to be a number (#680)
fix(typings): allow port to be a number (#680)

`string` is kept for backward compatibility (and `location.port` is a
string).

Reference: https://developer.mozilla.org/en-US/docs/Web/API/Location/port

Related: https://github.com/socketio/socket.io-client/issues/1444
socketio/engine.io-client,socketio/engine.io-client,socketio/engine.io-client