Add some pretty badges.

README.md

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 # Minecraft Overviewer Docker Container
 
+[![Docker](https://img.shields.io/docker/pulls/mide/minecraft-overviewer.svg)](https://hub.docker.com/r/mide/minecraft-overviewer/) [![Docker](https://img.shields.io/docker/stars/mide/minecraft-overviewer.svg)](https://hub.docker.com/r/mide/minecraft-overviewer/) [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/mide/minecraft-overviewer/master/LICENSE) [![GitHub issues](https://img.shields.io/github/issues/mide/minecraft-overviewer.svg)](https://github.com/mide/minecraft-overviewer/issues)
+
 Docker Container to Run [Minecraft Overviewer](https://overviewer.org/). Overviewer is a render that produces a Google Maps render of a [Minecraft](https://minecraft.net/en/) world.
 
 ## Goals