Bumps the Go version used to 1.8.4, which contains security fixes; https://groups.google.com/forum/#!topic/golang-announce/1hZYiemnkdE Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Upstream-commit: 33e8141f63ccc1a660529cd0d3581bd908bc8c1b Component: engine