Test on PHP 7.1+

Author: sad-spirit

.github/workflows/continuous-integration.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: ['ubuntu-latest']
-        php-version: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
+        php-version: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
 
     name: CI on ${{ matrix.operating-system }} with PHP ${{ matrix.php-version }}