docs(README): remove badge of drone.io

README.md

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 # dcmerge
 
-[![Build Status](https://drone.cryptic.systems/api/badges/volker.raschek/dcmerge/status.svg)](https://drone.cryptic.systems/volker.raschek/dcmerge)
 [![Docker Pulls](https://img.shields.io/docker/pulls/volkerraschek/dcmerge)](https://hub.docker.com/r/volkerraschek/dcmerge)
 
 `dcmerge` is a small program to merge docker-compose files from multiple sources. It is available via RPM and docker.