Update README.md CI badge to Github Actions badge

Author: Ayesh

README.md

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 # PHP Timer
 
-[![Latest Stable Version](https://poser.pugx.org/ayesh/php-timer/v/stable)](https://packagist.org/packages/ayesh/php-timer) [![License](https://poser.pugx.org/ayesh/php-timer/license)](https://packagist.org/packages/ayesh/php-timer)  [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/Ayesh/php-timer/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/Ayesh/php-timer/?branch=master) [![Build Status](https://travis-ci.org/Ayesh/php-timer.svg?branch=master)](https://travis-ci.org/Ayesh/php-timer)  [![codecov](https://codecov.io/gh/Ayesh/php-timer/branch/master/graph/badge.svg)](https://codecov.io/gh/Ayesh/php-timer) [![SensioLabsInsight](https://insight.sensiolabs.com/projects/54bcf54f-5087-45bf-9813-63c79a06a642/mini.png)](https://insight.sensiolabs.com/projects/54bcf54f-5087-45bf-9813-63c79a06a642) [![Too many badges](https://img.shields.io/badge/style-too_many-brightgreen.svg?style=toomany&label=badges)](https://github.com/Ayesh/php-timer)
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 ## Synopsis
 A helper class to calculate how long a particular task took.