feat(php): bump min php to 7.2

Author: Mte90

composer.json

@@ -4,7 +4,7 @@
     "description": "Codeat PHPCS ruleset for OOP WordPress development on PHP 7.0+, include phpmd ruleset",
     "license": "MIT",
     "require": {
-        "php": "~7.0",
+        "php": "~7.2",
         "squizlabs/php_codesniffer": "^3.5.3",
         "phpcompatibility/php-compatibility": "*",
         "phpcompatibility/phpcompatibility-wp": "*",