Add platform-agnostic xdebug remote host IP

Author: jfrederick

docker-compose.yml

@@ -29,9 +29,10 @@ services:
 #      PHP_XDEBUG_DEFAULT_ENABLE: 1
 #      PHP_XDEBUG_REMOTE_CONNECT_BACK: 0
 #      PHP_IDE_CONFIG: serverName=my-ide
-#      PHP_XDEBUG_REMOTE_HOST: 172.17.0.1 # Linux
-#      PHP_XDEBUG_REMOTE_HOST: 10.254.254.254 # macOS
-#      PHP_XDEBUG_REMOTE_HOST: 10.0.75.1 # Windows
+#      PHP_XDEBUG_REMOTE_HOST: host.docker.internal # Docker 18.03+ & Linux/Mac/Win
+#      PHP_XDEBUG_REMOTE_HOST: 172.17.0.1 # Linux, Docker < 18.03
+#      PHP_XDEBUG_REMOTE_HOST: 10.254.254.254 # macOS, Docker < 18.03
+#      PHP_XDEBUG_REMOTE_HOST: 10.0.75.1 # Windows, Docker < 18.03
     volumes:
       - ./:/var/www/html
 ## For macOS users (https://wodby.com/stacks/drupal/docs/local/docker-for-mac/)