Log Message:
lowdown: update to 0.7.5.

Version 0.7.5, 2020-12-09

- Add support for the Gemini protocol I've been hearing so much about.
  This may now be used from lowdown(1) or as a library in lowdown(3).
  This is a very simple output: it basically does no formatting at
  all, but does have some logic to shuffle around links.  Version

Version 0.7.4, 2020-08-29

- Bug-fix: don't emit stray .PP macros when in -Tman or -Tms mode.
This bug was introduced in version 0.7.3.

- The library is now usable from C++ applications as-is, without
  needing extra compilation flags.

- Add missing lowdown_diff(3) and lowdown_metaq_free(3) manpages.

Version 0.7.3, 2020-08-20

- Fix some smart typography bugs, specifically with ending single or
  double quotes. While doing so, create a regression suite for smart
  typography and update the manpage. Bug submitted by Larry Kollar,
  thanks!

- Make base header level metadata key work properly. Another bug
  submitted by Larry Kollar, thanks!

- Fix --nroff-hard-wrap to emit trailing newlines. Yet another bug
  submitted by Larry Kollar, thanks!

Larry further suggested using typographic conventions in both the
-Tlatex and -Tms output to have initial paragraphs not indent, but
subsequent ones should. This is the default mode in LaTeX, which
I was disabling. I've now removed my override to be more like
default LaTeX, and Larry proposed an initial patch for having -Tms
do the same. Thanks yet again!