Dropped support for php 7.2 for new phpunit version

Author: casperbakker

.github/workflows/phpunit.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.2', '7.3', '7.4', '8.0']
+        php-versions: ['7.3', '7.4', '8.0']
 
     steps:
     - uses: actions/checkout@v2

composer.json

@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "php": "^7.2|^8.0",
+        "php": "^7.3|^8.0",
         "ext-mbstring": "*"
     },
     "require-dev": {