Broken docker-compose link

[frafra]

README uses https://github.com/docker-compose/docker-compose as URL instead of https://github.com/docker/compose. I was going to open a PR, but I read <!--- If this is a fix for a typo (in code, documentation, or the README) please file an issue and let us sort it out. We do not need a PR --> :-)

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[frafra]

Still relevant.

[nemchik]

Fixed in #35 #36 #37