v2.0.0 to support WT32_ETH01

### Initial Releases v2.0.0

1. Initial coding to port [AsyncUDP](https://github.com/espressif/arduino-esp32/tree/master/libraries/AsyncUDP) to WT32_ETH01 (ESP32 + LAN8720)
2. Add more examples.
3. Add debugging features.
4. Bump up to v2.0.0 to sync with [AsyncUDP v2.0.0](https://github.com/espressif/arduino-esp32/tree/master/libraries/AsyncUDP).

Author: khoih-prog

README.md

@@ -622,7 +622,7 @@ If you want to contribute to this project:
 
 ### License
 
-- The library is licensed under [GPLv3](https://github.com/khoih-prog/AsyncUDP_WT32_ETH01/blob/master/LICENSE)
+- The library is licensed under [GPLv3](https://github.com/khoih-prog/AsyncUDP_WT32_ETH01/blob/main/LICENSE)
 
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