Explicitly add PHP code sniffer and mess detector to the requirements

composer.json

@@ -39,8 +39,10 @@
         "lakedrops/docker4drupal": "^1.0.0",
         "lakedrops/dorgflow": "^1.0.0",
         "mikey179/vfsStream": "^1.6",
+        "phpmd/phpmd": "^2.6.0",
         "phpspec/prophecy": "^1.8",
         "phpunit/phpunit": "4 - 5",
+        "squizlabs/php_codesniffer": "^3.3",
         "symfony/css-selector": "^3.4",
         "symfony/debug": "^3.4",
         "symfony/phpunit-bridge": "^3.4"