v1.2.4

### Releases v1.2.4

1. Add back MD5/SHA1 authentication feature.
2. Add example, update README.md, clean up.

README.md

@@ -42,7 +42,7 @@ to apply the better and faster **asynchronous** feature of the **powerful** [ESP
 
 ## Prerequisite
 
- 1. [`Arduino IDE 1.8.12+` for Arduino](https://www.arduino.cc/en/Main/Software)
+ 1. [`Arduino IDE 1.8.13+` for Arduino](https://www.arduino.cc/en/Main/Software)
  2. [`Arduino Core for STM32 1.9.0+`](https://github.com/stm32duino/Arduino_Core_STM32) for STM32 (Use Arduino Board Manager)
  3. [`STM32Ethernet library v1.2.0+`](https://github.com/stm32duino/STM32Ethernet) for built-in Ethernet on (Nucleo-144, Discovery)
  4. [`LwIP library v2.1.2+`](https://github.com/stm32duino/LwIP) for built-in Ethernet on (Nucleo-144, Discovery)