Proposal : Update Serie Yakusoku no Neverland japanese name

Proposal details

This proposal will make the following change(s):

Update the japanese name of the series Yakusoku no Neverland

Change the japanese name from Unknown to Yakusoku no Neverland

Based on the following reason: Need to be in database

With the source: https://kaize.io/serie/yakusoku-no-neverland