reamde: use build status badge from Gitlab CI

README.md

@@ -1,6 +1,6 @@
 Termux packages
 ===============
-[![Build Status](https://travis-ci.org/termux/termux-packages.svg?branch=master)](https://travis-ci.org/termux/termux-packages)
+[![pipeline status](https://gitlab.com/termux-mirror/termux-packages/badges/master/pipeline.svg)](https://gitlab.com/termux-mirror/termux-packages/commits/master)
 [![Join the chat at https://gitter.im/termux/termux](https://badges.gitter.im/termux/termux.svg)](https://gitter.im/termux/termux)
 
 This project contains scripts and patches to build packages for the [Termux](https://termux.com/) Android application. Note that packages are cross compiled and that on-device builds are not currently supported.