0.4.0

Changed

• Requires indexnowkit/core ^0.8 and indexnowkit/console ^0.2.

Added

• Check\SitemapSpoolCheck lines carry the code sitemap.spool (SitemapSpoolCheck::CODE; core 0.8 check --json).
• indexnow:sitemap warns after a run without --changed-since that submitted more than batch.max_urls URLs (the
  whole sitemap: engines see every page as changed): run it once, then schedule it with --changed-since (spec 17
  §3.3/§5.7). With --json the warning goes to stderr.