Update IRRemote ESP8266 to 2.6.2 and add ESP32 support

lib/IRremoteESP8266/examples/IRsendDemo/IRsendDemo.ino

@@ -28,9 +28,7 @@
  *     for your first time. e.g. ESP-12 etc.
  */
 
-#ifndef UNIT_TEST
 #include <Arduino.h>
-#endif
 #include <IRremoteESP8266.h>
 #include <IRsend.h>
 
@@ -53,7 +51,11 @@ uint8_t samsungState[kSamsungAcStateLength] = {
 
 void setup() {
   irsend.begin();
+#if ESP8266
   Serial.begin(115200, SERIAL_8N1, SERIAL_TX_ONLY);
+#else  // ESP8266
+  Serial.begin(115200, SERIAL_8N1);
+#endif  // ESP8266
 }
 
 void loop() {