Use with ESP32

[AcuarioCat]

I had problems using the library with an ESP32 so this is to help anyone in the same position.
I found I had to edit out the ->end, ->begin and ->flush lines in Ubx::Begin function in ubx.cpp

My code reads:
`
#define GPS_BAUD_RATE 921600
const int GPS_RX = 5;
const int GPS_TX = 4;

Serial2.begin(GPS_BAUD_RATE, SERIAL_8N1, GPS_RX, GPS_TX);

Gnss.Config(&Serial2);

`

and with that it works correctly.
Hope this helps.