Add disableInterruptPin()

Author: PsuFan

Adafruit_MCP23017.h

@@ -36,7 +36,8 @@ class Adafruit_MCP23017 {
   uint8_t readGPIO(uint8_t b);
 
   void setupInterrupts(uint8_t mirroring, uint8_t open, uint8_t polarity);
-  void setupInterruptPin(uint8_t p, uint8_t mode);
+  void setupInterruptPin(uint8_t pin, uint8_t mode);
+  void disableInterruptPin(uint8_t pin);
   uint8_t getLastInterruptPin();
   uint8_t getLastInterruptPinValue();