Add pipeline badge to README

README.md

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 # openvpn-install
 
+[![GitLab CI](https://gitlab.com/angristan/openvpn-install/badges/master/pipeline.svg)](https://gitlab.com/angristan/openvpn-install/pipelines)
+
 OpenVPN installer for Debian, Ubuntu, Fedora and CentOS.
 
 This script will let you setup your own secure VPN server in just a few minutes.