Update Mutation Score badge img uri

README.md

@@ -4,7 +4,7 @@ ParaTest
 [![Latest Stable Version](https://img.shields.io/packagist/v/brianium/paratest.svg)](https://packagist.org/packages/brianium/paratest)
 [![Downloads](https://img.shields.io/packagist/dt/brianium/paratest.svg)](https://packagist.org/packages/brianium/paratest)
 [![Integrate](https://github.com/paratestphp/paratest/workflows/CI/badge.svg)](https://github.com/paratestphp/paratest/actions)
-[![Infection MSI](https://badge.stryker-mutator.io/github.com/paratestphp/paratest/7.x)](https://dashboard.stryker-mutator.io/reports/github.com/paratestphp/paratest/7.x)
+[![Infection MSI](https://img.shields.io/endpoint?style=flat&url=https%3A%2F%2Fbadge-api.stryker-mutator.io%2Fgithub.com%2Fparatestphp%2Fparatest%2F7.x)](https://dashboard.stryker-mutator.io/reports/github.com/paratestphp/paratest/7.x)
 
 The objective of ParaTest is to support parallel testing in PHPUnit. Provided you have well-written PHPUnit tests, you can drop `paratest` in your project and
 start using it with no additional bootstrap or configurations!