Incorrect 'mailto' link scheme

[jsayol]

Bug description

When linking to an email address the URI has to be written as mailto://someone@example.com instead of mailto:someone@example.com. Only the second form is correct according to the standard.

Expected behaviour

The second form should work as expected and generate the link. Github's Markdown does it correctly.

Steps to reproduce

Write a comment on reddit containing the code

[test](mailto:someone@example.com)

which should be equivalent to the current

[test](mailto://someone@example.com)

Proposed fix

Remove the slashes in src/autolink.c to accept 'mailto:'. This will also keep backwards compatibility with the existing 'mailto://' links.

The code over at reddit is already correct.

[derekantrican]

There is also a current issue with reddit's mailto:// format. using something like

[link](mailto://example@gmail.com)

will open an email to //example@gmail.com. Trying to take out those slashes and using

[link](mailto:example@gmail.com)

means the link doesn't render through reddit markdown correctly