chore(package): update deepcopy to version 0.6.3
chore(package): update deepcopy to version 0.6.3

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