fix(package): update git-rev-sync to version 1.9.1 (#924)
fix(package): update git-rev-sync to version 1.9.1 (#924)

https://greenkeeper.io/
mozilla/web-ext,shubheksha/web-ext,shubheksha/web-ext,kumar303/web-ext,rpl/web-ext,mozilla/web-ext,rpl/web-ext,kumar303/web-ext