Simply a matter of updating the year, since it's again Google and Mind
for the FOSDEM2018 developer meeting.
Also add the 2017 sponsorship to the "Past sponsors" section.
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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