Add setPin() function

Add setPin() function, must set/change GPIO pin before calling begin().

src/EasyButton.cpp

@@ -7,6 +7,14 @@
 
 #include "EasyButton.h"
 
+void EasyButton::setPin(uint8_t pin)
+{
+	if (_time == 0)
+	{
+		_pin = pin;
+	}
+}
+
 void EasyButton::begin()
 {
 	pinMode(_pin, _pu_enabled ? INPUT_PULLUP : INPUT);

src/EasyButton.h

@@ -25,6 +25,7 @@ class EasyButton : public EasyButtonBase
 	~EasyButton() {}
 
 	// PUBLIC FUNCTIONS
+	virtual void setPin(uint8_t pin);		   // Set/Change GPIO pin, must set/change before calling begin().
 	virtual void begin();					   // Initialize a button object and the pin it's connected to.
 	bool read();							   // Returns the current debounced button state, true for pressed, false for released.
 	void update();							   // Update button pressed time, only needed when using interrupts.