Update README.md to indicate that our gitlab pipeline is building

README.md

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 OpenMW
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-[![Build Status](https://api.travis-ci.org/OpenMW/openmw.svg)](https://travis-ci.org/OpenMW/openmw) [![Build status](https://ci.appveyor.com/api/projects/status/github/openmw/openmw?svg=true)](https://ci.appveyor.com/project/psi29a/openmw)  [![Coverity Scan Build Status](https://scan.coverity.com/projects/3740/badge.svg)](https://scan.coverity.com/projects/3740)
+[![Build Status](https://api.travis-ci.org/OpenMW/openmw.svg)](https://travis-ci.org/OpenMW/openmw) [![Build status](https://ci.appveyor.com/api/projects/status/github/openmw/openmw?svg=true)](https://ci.appveyor.com/project/psi29a/openmw)  [![Coverity Scan Build Status](https://scan.coverity.com/projects/3740/badge.svg)](https://scan.coverity.com/projects/3740) [![pipeline status](https://gitlab.com/OpenMW/openmw/badges/master/pipeline.svg)](https://gitlab.com/OpenMW/openmw/commits/master)
 
 OpenMW is an open-source game engine that supports playing Morrowind by Bethesda Softworks. You need to own the game for OpenMW to play Morrowind.