Updated Dockerfile/README for the hg38 image [ci skip]

docker/hg38/Dockerfile

 FROM smei/mosaicatcher-pipeline
 
-MAINTAINER Sascha Meiers meiers@embl.de
-LABEL version="0.2"
+MAINTAINER Sascha Meiers sascha.meiers.embl@gmail.com
+LABEL version="0.3"
+LABEL description="This is the same as smei/mosaicatcher-pipeline but including\
+  the reference genome hg38."
 
 # Install wget
 RUN apt-get update \

docker/hg38/README.md

+# Docker image incl. hg38 reference genome
+
+This is the same as `smei/mosaicatcher-pipeline` but including the reference 
+genome *hg38*.
+
+
+### Availability
+
+* On [dockerhub](https://cloud.docker.com/repository/docker/smei/mosaicatcher-pipeline-hg38)
+
+### Updates
+
+This image is configured to auto-build on dockerhub. 
+
+**Note**: Since the auto-build is triggered simultaneously with
+`smei/mosaicatcher-pipeline` I don't think the most up-to-date version is utilized
+as base image. If this should ever be an issue just re-build this image yourself.
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