org.hl7.fhir.core/RELEASE_NOTES.md

Validator:

• Fix bug in unknown URL handling that could cause significant delays in validation (>1min / unknown URL)
• fix bug in processing excludes with filters in value sets

Other code changes:

• fix case problem with icons in questionnaire rendering
• fix problem with rendering nested slices on content references
• fix rendering on must-support view for must-support on types and target profiles