Changed Travis to Github Actions

Author: maxermolenko

.github/workflows/phpunit.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: [ '7.0', '7.1', '7.2', '7.3', '7.4' ]
+        php-versions: [ '7.1', '7.2', '7.3', '7.4' ]
     name: PHP ${{ matrix.php-versions }} - PHPUnit
     steps:
       - name: Checkout