v1.2.1

What's new

• README template expanded from 3 sections to the full 9-section
  structure (overview, experimental design, dataset contents,
  methods breakdown, known issues, references, contact), matching
  official BIDS README guidance instead of a shortened version.
• Added HEDVersion to the dataset_description.json template —
  was documented as RECOMMENDED in bids_reference.md but missing
  from the actual template.

Full Changelog: v1.2.0...v1.2.1