README: Drop dead layers badge

* RIP Micro Badger.

Author: kylemanna

README.md

@@ -4,7 +4,6 @@ Bitcoind for Docker
 [![Docker Stars](https://img.shields.io/docker/stars/kylemanna/bitcoind.svg)](https://hub.docker.com/r/kylemanna/bitcoind/)
 [![Docker Pulls](https://img.shields.io/docker/pulls/kylemanna/bitcoind.svg)](https://hub.docker.com/r/kylemanna/bitcoind/)
 [![Build Status](https://travis-ci.org/kylemanna/docker-bitcoind.svg?branch=master)](https://travis-ci.org/kylemanna/docker-bitcoind/)
-[![ImageLayers](https://images.microbadger.com/badges/image/kylemanna/bitcoind.svg)](https://microbadger.com/#/images/kylemanna/bitcoind)
 
 Docker image that runs the Bitcoin bitcoind node in a container for easy deployment.