v1.6.0 to save heap when sending large data

### Releases v1.6.0

1. Support using `CString` to save heap to send `very large data`. Check [request->send(200, textPlainStr, jsonChartDataCharStr); - Without using String Class - to save heap #8](khoih-prog/Portenta_H7_AsyncWebServer#8)
2. Add functions and example `Async_AdvancedWebServer_favicon` to support `favicon.ico`
3. Add multiple examples to demo the new feature
4. Fix issue with slow browsers or network
5. Change license from `MIT` to `GPLv3` to match with original [ESPAsyncWebServer](https://github.com/me-no-dev/ESPAsyncWebServer) license

Author: khoih-prog

README.md

@@ -2024,9 +2024,6 @@ Submit issues to: [AsyncWebServer_STM32 issues](https://github.com/khoih-prog/As
  2. Add support to more Ethernet / WiFi shield
  3. Add support to more STM32 boards.
  4. Add support to File using STM32-SD or STM32-FS
- 5. Fix issue with slow browsers or network
- 6. Add functions and example `Async_AdvancedWebServer_favicon` to support `favicon.ico`
- 7. Support using `CString` to save heap to send `very large data`. Check [request->send(200, textPlainStr, jsonChartDataCharStr); - Without using String Class - to save heap #8](https://github.com/khoih-prog/Portenta_H7_AsyncWebServer/pull/8)
 
 
 ## DONE
@@ -2038,7 +2035,9 @@ Submit issues to: [AsyncWebServer_STM32 issues](https://github.com/khoih-prog/As
  5. Add Authentication support (MD5, SHA1).
  6. Add support to **Ethernet LAN8720** using [STM32Ethernet library](https://github.com/stm32duino/STM32Ethernet), for boards such as **Nucleo-144 (F429ZI, NUCLEO_F746NG, NUCLEO_F746ZG, NUCLEO_F756ZG), Discovery (DISCO_F746NG)** and **STM32F4 boards (BLACK_F407VE, BLACK_F407VG, BLACK_F407ZE, BLACK_F407ZG, BLACK_F407VE_Mini, DIYMORE_F407VGT, FK407M1)**. Tested on **STM32F4 BLACK_F407VE**.
  7. Add Table-of-Contents and Version String
- 
+ 8. Fix issue with slow browsers or network
+ 9. Add functions and example `Async_AdvancedWebServer_favicon` to support `favicon.ico`
+10. Support using `CString` to save heap to send `very large data`. Check [request->send(200, textPlainStr, jsonChartDataCharStr); - Without using String Class - to save heap #8](https://github.com/khoih-prog/Portenta_H7_AsyncWebServer/pull/8)
 
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