chore(package): update babel-core to version 6.17.0 (#548)
chore(package): update babel-core to version 6.17.0 (#548)

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