LDP-1300: Add vendor hardening plugin. (#53)

Co-authored-by: Petar <petar.basic@drunomics.com>

Author: petarbasic

composer.json

@@ -164,7 +164,8 @@
             "cweagans/composer-patches": true,
             "dealerdirect/phpcodesniffer-composer-installer": true,
             "oomphinc/composer-installers-extender": true,
-            "drupal/core-composer-scaffold": true
+            "drupal/core-composer-scaffold": true,
+            "drupal/core-vendor-hardening": true
         }
     },
     "suggest": {