- Bumps @version to 3.7.0 and the README install snippet to ~> 3.7
- Promotes ## [Unreleased] to a 3.7.0 header, dated today
- Leads the changelog with short-circuit AND/OR as the headline
  observable behavior change
- Frames the ISA v2 additions (make_list, jump_if_falsy_or_pop,
  jump_if_true_or_pop) as a cross-language interchange-format
  change the Ruby and JavaScript siblings need for parity (ADR-0001)
- Consolidates duplicate Changed/Fixed headings left behind by
  separate feature PRs

Refs: px-e3g.7