Hide the pipeline status until pipelines are fixed

README.md

 Gitlab External User Manager
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-[![pipeline status](https://gitlab.liu.se/aleol57/gitlab-eum/badges/master/pipeline.svg)](https://gitlab.liu.se/aleol57/gitlab-eum/commits/master)
-
 Allows already registered users to create additional external users, to allow read/write access for repositories hosted on a GitLab instance without signup enabled.
 
 ## Development