v3.5.0

Fixed

• Add plugin locking before checkout #827 (@lox)
• Ensure pipeline parser maintains map order in output #824 (@lox)
• Update aws sdk #818 (@sj26)
• Fix boostrap typo #814 (@ChefAustin)

Changed

• annotate takes body as an arg, or reads from a pipe #813 (@sj26)
• Respect pre-set BUILDKITE_BUILD_CHECKOUT_PATH #806 (@lox)
• Add time since last successful heartbeat/ping #810 (@lox)
• Updating launchd templates to only restart on error #804 (@lox)
• Allow more time for systemd graceful stop #819 (@lox)