add microbadger docker layer badge

microbadger.com provides metadata information about docker images hosted on hub.docker.com this metadata can be useful to track size and layer count of docker images
traum-ferienwohnungen · Aug 18, 2016 · c36dd0b · c36dd0b
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 # Wkhtmltopdf Docker Container
 
 [![Build Status](https://travis-ci.org/madnight/docker-wkhtmltopdf.svg?branch=master)](https://travis-ci.org/madnight/docker-wkhtmltopdf)
+[![Image Layers](https://images.microbadger.com/badges/image/traumfewo/docker-wkhtmltopdf.svg)](http://microbadger.com/images/traumfewo/docker-wkhtmltopdf)
 
 This docker container lets you run wkhtmltopdf in a docker container.