Update README

Author: ahmadmayahi

README.md

@@ -9,7 +9,7 @@
 [![Tests](https://github.com/ahmadmayahi/php-google-vision/actions/workflows/run-tests.yml/badge.svg)](https://github.com/ahmadmayahi/php-google-vision/actions/workflows/run-tests.yml)
 [![Check & fix styling](https://github.com/ahmadmayahi/php-google-vision/actions/workflows/php-cs-fixer.yml/badge.svg)](https://github.com/ahmadmayahi/php-google-vision/actions/workflows/php-cs-fixer.yml)
 <br/>
-[![codecov](https://codecov.io/gh/ahmadmayahi/php-google-vision/branch/main/graph/badge.svg?token=hayMyn8tLI)](https://codecov.io/gh/ahmadmayahi/php-google-vision)
+[![Test Coverage](https://codecov.io/gh/ahmadmayahi/php-google-vision/branch/main/graph/badge.svg?token=hayMyn8tLI)](https://codecov.io/gh/ahmadmayahi/php-google-vision)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/ahmadmayahi/php-google-vision/badges/quality-score.png?b=main)](https://scrutinizer-ci.com/g/ahmadmayahi/php-google-vision/?branch=main)
 [![Code Intelligence Status](https://scrutinizer-ci.com/g/ahmadmayahi/php-google-vision/badges/code-intelligence.svg?b=main)](https://scrutinizer-ci.com/code-intelligence)