Major Releases v1.2.0

### Major Releases v1.2.0

1. Configurable **Customs HTML Headers**, including Customs Style, Customs Head Elements, CORS Header.
2. Add functions to control Config Portal from software or Virtual Switches. Check [How to trigger a Config Portal from code #25](khoih-prog/Blynk_WM#25)
3. Use more efficient [**FlashStorage_STM32 v1.0.1**](https://github.com/khoih-prog/FlashStorage_STM32)
4. Fix Config Portal Bug. 
5. Update examples
6. Bump up to version v1.2.0 to sync with [**Ethernet_Manager**](https://github.com/khoih-prog/Ethernet_Manager)

CONTRIBUTING.md

@@ -29,7 +29,7 @@ Please ensure to specify the following:
 Arduino IDE version: 1.8.13
 Arduino STM32 core v1.9.0
 OS: Ubuntu 20.04 LTS
-Linux xy-Inspiron-3593 5.4.0-51-generic #56-Ubuntu SMP Mon Oct 5 14:28:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
+Linux xy-Inspiron-3593 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
 
 Context:
 The board couldn't autoreconnect to Local Blynk Server after router power recycling.