Fixed docker image size badge. [skip ci]

Author: jlesage

README.md

@@ -1,5 +1,5 @@
 # Docker container for Nginx Proxy Manager
-[![Docker Image Size](https://img.shields.io/microbadger/image-size/jlesage/nginx-proxy-manager)](http://microbadger.com/#/images/jlesage/nginx-proxy-manager) [![Build Status](https://drone.le-sage.com/api/badges/jlesage/docker-nginx-proxy-manager/status.svg)](https://drone.le-sage.com/jlesage/docker-nginx-proxy-manager) [![GitHub Release](https://img.shields.io/github/release/jlesage/docker-nginx-proxy-manager.svg)](https://github.com/jlesage/docker-nginx-proxy-manager/releases/latest) [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://paypal.me/JocelynLeSage/0usd)
+[![Docker Image Size](https://img.shields.io/docker/image-size/jlesage/nginx-proxy-manager/latest)](https://hub.docker.com/r/jlesage/nginx-proxy-manager/tags) [![Build Status](https://drone.le-sage.com/api/badges/jlesage/docker-nginx-proxy-manager/status.svg)](https://drone.le-sage.com/jlesage/docker-nginx-proxy-manager) [![GitHub Release](https://img.shields.io/github/release/jlesage/docker-nginx-proxy-manager.svg)](https://github.com/jlesage/docker-nginx-proxy-manager/releases/latest) [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://paypal.me/JocelynLeSage/0usd)
 
 This is a Docker container for [Nginx Proxy Manager](https://nginxproxymanager.jc21.com).