I-5 Add 'jfcherng/php-diff' library

Author: DEVizzent

composer.json

@@ -25,7 +25,8 @@
     "php": "7.4.*||8.*",
     "guzzlehttp/guzzle": "^7.0",
     "codeception/codeception": "4.*||5.*",
-    "phpunit/phpunit": "^8.5 || 9.*"
+    "phpunit/phpunit": "^8.5 || 9.*",
+    "jfcherng/php-diff": "^6.14"
   },
   "require-dev": {
     "phpmd/phpmd": "2.*",