Add delay to IRrecvDemo Loop preventing duplicates

Prevents duplicates in serial when button was only pressed once.

examples/IRrecvDemo/IRrecvDemo.ino

@@ -25,4 +25,5 @@ void loop() {
     Serial.println(results.value, HEX);
     irrecv.resume(); // Receive the next value
   }
+  delay(100);
 }