chore(package): update copy-webpack-plugin to version 4.0.0 (#1458)
chore(package): update copy-webpack-plugin to version 4.0.0 (#1458)

https://greenkeeper.io/
mozilla/tofino,bgrins/tofino,victorporof/tofino,jsantell/tofino,victorporof/tofino,jsantell/tofino,bgrins/tofino,mozilla/tofino,mozilla/tofino,jsantell/tofino,bgrins/tofino,mozilla/tofino,jsantell/tofino,bgrins/tofino