Update README.md

Author: khoih-prog

README.md

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 # ESP8266 TimerInterrupt Library
 
 [![arduino-library-badge](https://www.ardu-badge.com/badge/ESP8266TimerInterrupt.svg?)](https://www.ardu-badge.com/ESP8266TimerInterrupt)
+[![GitHub release](https://img.shields.io/github/release/khoih-prog/ESP8266TimerInterrupt.svg)](https://github.com/khoih-prog/ESP8266TimerInterrupt/releases)
+[![GitHub](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/khoih-prog/ESP8266TimerInterrupt/blob/master/LICENSE)
+[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
+[![GitHub issues](https://img.shields.io/github/issues/khoih-prog/ESP8266TimerInterrupt.svg)](http://github.com/khoih-prog/ESP8266TimerInterrupt/issues)
 
 This library enables you to use Interrupt from Hardware Timers on an ESP8266-based board.