Merge remote-tracking branch 'origin/master'

Author: doganoo

composer.json

@@ -22,7 +22,9 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "6.5"
+    "phpunit/phpunit": "6.5",
+    "squizlabs/php_codesniffer": "^3.5",
+    "phpcompatibility/php-compatibility": "^9.3"
   },
   "require": {
     "php": ">=7.1",