README: Add link to latest stable release

README.md

@@ -6,8 +6,11 @@
 <a href="https://build.loophabits.org/project.html?projectId=LoopHabitTracker&tab=preport_project1_Coverage__core_&guest=1">
   <img src="https://build.loophabits.org/app/rest/builds/buildType(id:release)/artifacts/content/coverage-badge.svg?guest=1" />
 </a>
+<a href="https://github.com/iSoron/uhabits/releases/latest">
+  <img src="https://img.shields.io/badge/apk-stable-FF4081.svg" />
+</a>
 <a href="https://build.loophabits.org/app/rest/builds/buildType(id:release)/artifacts/content/loop-dev.apk?guest=1">
-  <img src="https://img.shields.io/badge/apk-dev-FF4081.svg" />
+  <img src="https://img.shields.io/badge/apk-nightly-FF4081.svg" />
 </a>
 
 Loop is a simple Android app that helps you create and maintain good habits,