fix(package): update addons-linter to version 0.21.0 (#964)
fix(package): update addons-linter to version 0.21.0 (#964)


rpl/web-ext,mozilla/web-ext,shubheksha/web-ext,kumar303/web-ext,kumar303/web-ext,shubheksha/web-ext,rpl/web-ext,mozilla/web-ext