Remove 404 Travis image

Travis was suspended php#15314

[skip ci]

Author: petk

README.md

@@ -15,7 +15,6 @@ blog to the most popular websites in the world. PHP is distributed under the
 [PHP License v3.01](LICENSE).
 
 [![Push](https://github.com/php/php-src/actions/workflows/push.yml/badge.svg)](https://github.com/php/php-src/actions/workflows/push.yml)
-[![Build status](https://travis-ci.com/php/php-src.svg?branch=master)](https://travis-ci.com/github/php/php-src)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/php.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:php)
 
 ## Documentation