use github action's test status badge.

Author: diasbruno

Readme.md

@@ -1,6 +1,6 @@
 # clib(1)
 
-  [![Build Status](https://travis-ci.org/clibs/clib.svg?branch=master)](https://travis-ci.org/clibs/clib)
+  ![Build Status](https://github.com/clibs/clib/actions/workflows/tests.yml/badge.svg)
   [![Codacy Badge](https://app.codacy.com/project/badge/Grade/a196ec36c31349e18b6e4036eab1d02c)](https://www.codacy.com/gh/clibs/clib?utm_source=github.com&utm_medium=referral&utm_content=clibs/clib&utm_campaign=Badge_Grade)
 
   Package manager for the C programming language.