This rule is triggered whenever a URL is given that isn't surrounded by angle
brackets:
For more information, see http://www.example.com/.
For more information, see <http:></http:>.
Rationale: Without angle brackets, the URL isn't converted into a link in many
markdown parsers.
Note: if you do want a bare URL without it being converted into a link,
enclose it in a code block, otherwise in some markdown parsers it will be
converted: