Update readme

Author: mezentsevs

README.md

@@ -59,7 +59,7 @@ wsl
 docker exec -it virtual-file-system-laravel.test-1 bash
 ```
 
-- Install php dependencies:
+- Install php dependencies (optional, if missing some required php extension in base system):
 ``` bash
 git config --global --add safe.directory /var/www/html
 composer install