Make CI badge clickable

Author: fpistm

README.md

@@ -1,7 +1,9 @@
 # Arduino core support for STM32 based boards
 [![forums](https://img.shields.io/badge/join-the%20forums-blue.svg)](https://www.stm32duino.com/)
 [![wiki](https://img.shields.io/badge/browse-the%20wiki-orange.svg)](https://github.com/stm32duino/wiki/wiki)
-![STM32 Core Continuous Integration](https://github.com/stm32duino/Arduino_Core_STM32/workflows/STM32%20Core%20Continuous%20Integration/badge.svg?branch=master)
+[![STM32 Core Continuous Integration](https://github.com/stm32duino/Arduino_Core_STM32/workflows/STM32%20Core%20Continuous%20Integration/badge.svg?branch=master)](https://github.com/stm32duino/Arduino_Core_STM32/actions)
+
+
 
 [![GitHub release](https://img.shields.io/github/release/stm32duino/Arduino_Core_STM32.svg)](https://github.com/stm32duino/Arduino_Core_STM32/releases/latest)
 ![GitHub All Releases](https://img.shields.io/github/downloads/stm32duino/Arduino_Core_STM32/total.svg?label=downloads%20since%201.4.0)