docs(readme): add code coverage badge

README.md

@@ -6,7 +6,7 @@
 <p align="center">
   <a href="https://npmjs.com/package/serverest"><img alt="serverest version" src="https://img.shields.io/npm/v/serverest?style=for-the-badge"></a>
   <a href="https://hub.docker.com/r/paulogoncalvesbh/serverest"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/paulogoncalvesbh/serverest?style=for-the-badge"></a>
-  <a href="https://dashboard.stryker-mutator.io/reports/github.com/ServeRest/ServeRest/trunk"><img alt="Mutation test score" src="https://img.shields.io/endpoint?style=for-the-badge&url=https%3A%2F%2Fbadge-api.stryker-mutator.io%2Fgithub.com%2FServeRest%2FServeRest%2Ftrunk"></a>
+  <a href="https://sonarcloud.io/summary/overall?id=ServeRest"><img alt="Sonar code coverage score" src="https://img.shields.io/sonar/coverage/ServeRest?server=https%3A%2F%2Fsonarcloud.io&style=for-the-badge"></a>
   <a href="https://npm-stat.com/charts.html?package=serverest"><img alt="serverest total downloads" src="https://img.shields.io/npm/dt/serverest?color=blue&style=for-the-badge"></a>
 </p>