GitLab and TravisCI can no longer build versions of this package

GitLab now is failing on PHP versions 7.0, 7.1, 7.3, and 7.4 due to an error installing the PHP ZIP extension.

TravisCI is failing on PHP versions 7.3 and 7.4 due to using XDebug version 3.0 and the constants not being compatible with the PHPUnit use for testing.

This is no fault of the package, but of the test runners.

Therefore, I'm removing the badges of the GitLab CI and TravisCI, and adding the badge for GitHub Actions.

Author: jb-lopez

.github/workflows/php.yml

@@ -1,4 +1,4 @@
-name: PHP Composer
+name: PHPUnit Tests
 
 on:
   push:

README.md

@@ -6,10 +6,7 @@ This port is written in PHP and without any other requirements.
 
 The goal is that this library can be used by those whom cannot install the PHP Trader extension.
 
-[![pipeline status](https://gitlab.com/LupeCode/phpTraderNative/badges/master/pipeline.svg)](https://gitlab.com/LupeCode/phpTraderNative/commits/master)
-[![coverage report](https://gitlab.com/LupeCode/phpTraderNative/badges/master/coverage.svg)](https://gitlab.com/LupeCode/phpTraderNative/commits/master)
-[![Build Status](https://travis-ci.org/LupeCode/phpTraderNative.svg?branch=master)](https://travis-ci.org/LupeCode/phpTraderNative)
-[![Coverage Status](https://coveralls.io/repos/github/LupeCode/phpTraderNative/badge.svg?branch=master)](https://coveralls.io/github/LupeCode/phpTraderNative?branch=master)
+![PHPUnit Tests](https://github.com/LupeCode/phpTraderNative/workflows/PHPUnit%20Tests/badge.svg)
 
 ## Requirements