IPv6 Links In Markdown (Links With Square Brackets)

In order to link to IPv6 addresses directly in markdown, use a standard HTML anchor tag:

<a href="http://[2a01:7e00:e001:c500::1]">http://[2a01:7e00:e001:c500::1]</a>

Other forms of markdown linking don't work well with the square brackets.

Example on this GitHub readme: https://github.com/JamieOnUbuntu/jamieweb/blob/master/README.md
See section "Other" -> "IPv6 Direct (403 Forbidden)".