v1.6.0 to autodetect ESP32 core version

### Release v1.6.0

1. Auto detect ESP32 core and use either built-in LittleFS or [LITTLEFS](https://github.com/lorol/LITTLEFS) library. 
2. Fix bug returning IP `255.255.255.255` in core v2.0.0+ when using `hostname`

Author: khoih-prog

README.md

@@ -1999,6 +1999,7 @@ Submit issues to: [ESPAsync_WiFiManager_Lite issues](https://github.com/khoih-pr
 19. Add support to **ESP32-S2 (ESP32-S2 Saola, AI-Thinker ESP-12K, etc.) using EEPROM, LittleFS and SPIFFS**
 20. Add support to **ESP32-C3 using EEPROM and SPIFFS**
 21. Enable **scan of WiFi networks** for selection in Configuration Portal
+22. Ready for ESP32 core v2.0.0+
 
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