chore(package): update @types/webpack to version 3.0.4
chore(package): update @types/webpack to version 3.0.4

Closes #616
Tosuke/misskey,ha-dai/Misskey,Tosuke/misskey,Tosuke/misskey,syuilo/Misskey,ha-dai/Misskey,syuilo/Misskey,Tosuke/misskey,Tosuke/misskey