Guillaume is busy full-time on his new business, and no longer available
as a maintainer.

Best of luck on your e-commerce business Guillaume, and thanks for all
the great contributions!

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Merge pull request #6448 from shykes/pr_out_guillaume_is_busy_full_time_on_his_new_business_and_no_longer_available_as_a_maintainer