Added pinMode setting to attach

Added possibility to attach the pin and auto set the pinMode. Attach and
pinMode can now be done in 1 step. just call Bounce.attach(pin,
INPUT_PULLUP) etc

Bounce2.cpp

@@ -33,6 +33,17 @@ void Bounce::attach(int pin) {
 #endif
 }
 
+void Bounce::attach(int pin, byte mode){
+  if(mode == INPUT_PULLUP){
+    pinMode(pin, INPUT_PULLUP);
+  }
+  else{
+    pinMode(pin, INPUT);
+  }
+  
+  this->attach(pin);
+}
+
 void Bounce::interval(uint16_t interval_millis)
 {
     this->interval_millis = interval_millis;