Update Docker to 18.09

#1

The latest base Bitrise Docker image has a bit outdated docker, it would great to have it updated to 18.09 to take advantage of buildkit builds.

I’ve create a pull request for it: https://github.com/bitrise-docker/bitrise-base/pull/266

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#2

Thank you, a review will come soon! :upside_down_face:

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