Badge fixes

Updated Maven Central badge URL in README.md.

Author: motorro

README.md

@@ -1,4 +1,4 @@
-# AppUpdateWrapper [![Check](https://github.com/motorro/AppUpdateWrapper/actions/workflows/check.yml/badge.svg?branch=master)](https://github.com/motorro/AppUpdateWrapper/actions/workflows/check.yml) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.motorro.appupdatewrapper/appupdatewrapper/badge.png)](https://repo1.maven.org/maven2/com/motorro/appupdatewrapper/appupdatewrapper/)
+# AppUpdateWrapper [![Check](https://github.com/motorro/AppUpdateWrapper/actions/workflows/check.yml/badge.svg?branch=master)](https://github.com/motorro/AppUpdateWrapper/actions/workflows/check.yml) [![Maven Central](https://maven-badges.sml.io/maven-central/com.motorro.appupdatewrapper/appupdatewrapper/badge.png)](https://repo1.maven.org/maven2/com/motorro/appupdatewrapper/appupdatewrapper/)
 
 A wrapper for [Android AppUpdateManager](https://developer.android.com/reference/com/google/android/play/core/appupdate/AppUpdateManager) 
 to simplify in-app update flow.