* README.md: Mention URLs for SourceForge, GitHub, and GitLab
repositories.
The user discussion and development of strace take place on [the strace mailing list](https://lists.sourceforge.net/lists/listinfo/strace-devel) -- everyone is welcome to post bug reports, feature requests, comments and patches to strace-devel@lists.sourceforge.net. The mailing list archives are available at https://sourceforge.net/p/strace/mailman/strace-devel/ and other archival sites.
+The GIT repository of strace is available at [SourceForge](https://sourceforge.net/p/strace/code/ci/master/tree/), [GitHub](https://github.com/strace/strace/), and [GitLab](https://gitlab.com/strace/strace/).
+
[![Build Status](https://travis-ci.org/strace/strace.svg?branch=master)](https://travis-ci.org/strace/strace) [![Code Coverage](https://codecov.io/github/strace/strace/coverage.svg?branch=master)](https://codecov.io/github/strace/strace?branch=master)