hed-validator v3.9.0

New to this release:

• Support for Onset and Offset validation.
• Switched to ES modules.
• Started to link issues to HED 3 error codes.

What's Changed

• Port entire codebase to ES modules by @happy5214 in #86
• Add advanced features (part 1) by @happy5214 in #87
• Bump qs from 6.10.1 to 6.11.0 by @dependabot in #92
• Bump json5 from 2.2.1 to 2.2.3 by @dependabot in #93
• Update remote schema URLs and SCORE schema tests and bundled copy by @happy5214 in #94
• Implement onset-offset validation by @happy5214 in #95

Full Changelog: v3.8.0...v3.9.0