GPIO1 must be connected to +5V, preferably via 1k resistor. Since there is an internal pull-up resistor in PIC, you may also leave this pin floating. You can comment checking this pin out from code if you don't need it. My application needed disabling reader.
Likewise you may change code to implement external xtal oscillator. X-tal can be connected to GPIO5&4 only but since GPIO3 and 2 are free, you can do this. You will need a pull-up for GPIO3 (it does not have internal one.