mdcat-0.21.0

Added

• Add --paginate flag to paginate the output of mdcat (see GH-152);
  with this flag mdcat sends it output to less -R or any alternative pager set in $MDCAT_PAGER or $PAGER.
  This flag also disables all terminal-specific formatting as the pager likely won't support it.
• Paginate output by default if invoked as mdless, that is, if mdcat is hard-linked to mdless.

Fixed

• Render email autolinks (i.e. <hello@example.com>) as mailto: links.