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The new version understands CIPD packages that use SHA256 as identifier. Such
packages soon will start to appear (and the old version won't be able to handle
them).

Relevant changes:
https://chromium.googlesource.com/infra/luci/luci-go/+log/9449d18..75f8e8f/cipd

R=dpranke@chromium.org, maruel@chromium.org
TBR=bsheedy@chromium.org
BUG=821194

Change-Id: Ic11a8cb822e4574f7709588dc566f15badaa12a6
Reviewed-on: https://chromium-review.googlesource.com/1152103Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578461}