Document human phrase-grounding release

CHANGELOG.md

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+## tasksource/flickr30k-grounding v2026.10.16
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+- Add 100,000 human-labeled training phrase-to-box decisions, 11,232 validation questions and 11,560 test questions, grouped by unchanged Flickr30k image.
+- Preserve native image partitions; require one native target box and distinct annotated-region choices. Exclude the publisher’s known unrelated captions and multi-box/no-box targets.
+- Record original noncommercial research/education and Flickr image terms, source revisions and conversion hashes.
+