chore(package): update @types/node to version 8.0.49
chore(package): update @types/node to version 8.0.49

Closes #878
Tosuke/misskey,ha-dai/Misskey,Tosuke/misskey,Tosuke/misskey,Tosuke/misskey,syuilo/Misskey,Tosuke/misskey,ha-dai/Misskey,syuilo/Misskey