Chore: Update README.md to replace version and download badges with test workflow badge

Author: othercodes

README.md

@@ -1,7 +1,6 @@
 # Contracts
 
-[![Latest Stable Version](https://poser.pugx.org/complex-heart/contracts/v)](//packagist.org/packages/complex-heart/contracts)
-[![Total Downloads](https://poser.pugx.org/complex-heart/contracts/downloads)](//packagist.org/packages/complex-heart/contracts)
+[![Test](https://github.com/ComplexHeart/php-contracts/actions/workflows/test.yml/badge.svg)](https://github.com/ComplexHeart/php-contracts/actions/workflows/test.yml)
 
 Common interfaces for PHP Complex Heart SDK.