[cipd] bump user agent version
[cipd] bump user agent version

TBR=vadimsh@chromium.org
TBR_REASON=version number bump only
BUG=

Review-Url: https://codereview.chromium.org/2689973002

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go