Readme: Fix build-status icon link for Travis CI

Author: Ayesh

README.md

@@ -14,7 +14,7 @@ web development. Fast, flexible and pragmatic, PHP powers everything from your
 blog to the most popular websites in the world. PHP is distributed under the
 [PHP License v3.01](LICENSE).
 
-[![Build status](https://travis-ci.com/php/php-src.svg?branch=master)](https://travis-ci.com/php/php-src)
+[![Build status](https://travis-ci.com/php/php-src.svg?branch=master)](https://travis-ci.com/github/php/php-src)
 [![Build status](https://ci.appveyor.com/api/projects/status/meyur6fviaxgdwdy/branch/master?svg=true)](https://ci.appveyor.com/project/php/php-src)
 [![Build Status](https://dev.azure.com/phpazuredevops/php/_apis/build/status/php.php-src?branchName=master)](https://dev.azure.com/phpazuredevops/php/_build/latest?definitionId=1&branchName=master)
 [![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)