WIP: Replace coveralls badges

Author: MarcusNotheis

README.md

@@ -4,8 +4,8 @@
   <a href="https://travis-ci.org/SAP/ui5-webcomponents-react" target="_blank">
     <img alt="Build Status" src="https://img.shields.io/travis/SAP/ui5-webcomponents-react/master.svg">
   </a>
-  <a href="https://coveralls.io/github/SAP/ui5-webcomponents-react" target="_blank">
-    <img alt="Code Coverage" src="https://img.shields.io/coveralls/github/SAP/ui5-webcomponents-react/master.svg">
+  <a href="https://codecov.io/gh/SAP/ui5-webcomponents-react">
+    <img src="https://codecov.io/gh/SAP/ui5-webcomponents-react/branch/master/graph/badge.svg" />
   </a>
   <!-- <a href="https://sap-ea.slack.com/messages/CEN48B210" target="_blank">
     <img alt="Slack Badge" src="https://badgen.net/badge/slack/ui5-webcomponents-react/orange?icon=slack">

packages/docs/Welcome.stories.mdx

@@ -6,7 +6,7 @@ import { Button } from '@ui5/webcomponents-react/lib/Button';
 
 # UI5 Web Components for React
 [![](https://img.shields.io/travis/SAP/ui5-webcomponents-react/master.svg)](https://travis-ci.org/SAP/ui5-webcomponents-react)
-[![](https://img.shields.io/coveralls/github/SAP/ui5-webcomponents-react/master.svg)](https://coveralls.io/github/SAP/ui5-webcomponents-react)
+[![codecov](https://codecov.io/gh/SAP/ui5-webcomponents-react/branch/master/graph/badge.svg)](https://codecov.io/gh/SAP/ui5-webcomponents-react)
 [![](https://img.shields.io/npm/v/@ui5/webcomponents-react/latest.svg)](https://www.npmjs.com/package/@ui5/webcomponents-react)
 [![](https://img.shields.io/npm/v/@ui5/webcomponents-react/next.svg)](https://www.npmjs.com/package/@ui5/webcomponents-react)
 [![GitHub stars](https://img.shields.io/github/stars/SAP/ui5-webcomponents-react?style=social)](https://github.com/SAP/ui5-webcomponents-react/stargazers)