Minor corrections to README.md (#264)
Minor corrections to README.md (#264)

One example was missing a useful line, which was present in the wiki's example and without which the example does not run.

A typographical error was found in a file.
tomav/docker-mailserver,keslerm/docker-mailserver,tomav/docker-mailserver,Narzhan/docker-smtp,alinmear/docker-mailserver,tomav/docker-mailserver