handle optional preview blocks

[todo]

routes/lib/endpoint/find-accept-header.js

Lines 7 to 12 in ff733a9

	// TODO: handle optional preview blocks
	const requiredPreviewHeaderBlocks = previewBlocks.filter(block => block.required)
	const defaultAcceptHeader = requiredPreviewHeaderBlocks.length
	? requiredPreviewHeaderBlocks.map(block => `application/vnd.github.${block.preview}-preview+json`).join(',')
	: 'application/vnd.github.v3+json'
	const acceptHeaderParam = {

---

This issue was generated by todo based on a TODO: comment in ff733a9 when #482 was merged. cc @octokit.

[github-actions]

🎉 This issue has been resolved in version 23.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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