Small documentation fix: incorrect Docker Compose example

[V-Guseva]

Hello,
I found a small issue in the documentation.

In the README (section "Docker Compose"), the example shows:
test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]

However, the image does not contain curl, so this command fails by default.

Suggested fix:

• either replace curl with a TCP check (no dependency), like
  test: [ "CMD-SHELL", "echo > /dev/tcp/127.0.0.1/9000 && exit 0 || exit 1" ]
• or consider adding basic utilities (e.g. curl/wget)
• or providing a lightweight layer with them.

Thank you for maintaining this image!