anchors-test Check case-sensetivity and other conversion rules of GitHub anchors a.md has headings H1, Some heading, Heading with dot., Heading with dot. And some words after a.md#h1 working a.md#H1 working a.md#SoMe-HeAdInG working a.md#someheading broken a.md#Heading-with-dot working a.md#heading-with-dot- broken a.md#heading-with-dot-and-some-words-after working a.md#heading-with-dot--and-some-words-after broken