Postal code data (Japan)

Source: Japan Post "郵便番号データ" (https://www.post.japanpost.jp/zipcode/download.html),
converted via yubinbango-data (https://github.com/yubinbango/yubinbango-data).
Japan Post does not claim copyright on the postal code data and allows free redistribution.

Format: one file per first 3 digits. {"1000001":[13,"千代田区","千代田"]}
[prefecture code (JIS X 0401), city, town, (street for large offices)]

The data is bundled with the plugin and looked up in the browser.
No address or postal code is sent to any external service.
