URL whitelist is case sensitive

[Slowftw]

Non-lowercase URLs are being treated as unsafe. By the way, it would be more correct to use / instead of unsafe: ?

quill-delta-to-html/src/helpers/url.ts

Lines 4 to 8 in a75bc6b

	let whiteList = /^((https?|s?ftp|file|blob|mailto|tel):|#|\/|data:image\/)/;
	if (whiteList.test(val)) {
	return val;
	}
	return 'unsafe:' + val;