Listen on IPv4 and IPv6 by default #486
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Should fix #484
Maildev currently listens on IPv4 only, which causes the healthcheck to fail with some Docker versions or custom daemon settings. Most dockerized apps that I've seen listen on both IPv4 and IPv6.
This should be documented as a breaking change to avoid unwanted exposure of Maildev in case someone has a particular config (for example a Docker daemon configured to use a public IPv6 block)