Revert "docs: run Docker Compose in wait mode (#26)"

This reverts commit fa4c8b1.

Author: dunglas

README.md

@@ -29,7 +29,6 @@ docker run \
     -v $PWD:/app \
     -p 80:80 -p 443:443/tcp -p 443:443/udp \
     --name FrankenPHP-demo \
-    --wait \
     dunglas/frankenphp
 ```