v5.0.0

• Fix Fastify version typo in README (#76)
• Export originCallback and originFunction (#64)
• test: test for access-control-request-headers scenario (#77) (#80)
• test: test for array and regex origin options (#77) (#81)
• test: full code coverage (#77) (#82)
• feat: add stale (#90)
• Mention maxAge is in seconds (#94)
• feat: Strict preflight with handler (#96)
• chore: add dependabot automerge (#100)
• chore: refactor for clarity (#99)