ChangeLog:
Version 0.8.1, 2021-02-09
Add --term-nolinks to strip URLs out of terminal output (when alternative
text is available). Then add --nroff-nolinks and --nroff-shortlinks, just
like those for -Tterm, for use with -Tman or --nroff-no-groff.
Fix long-standing kinda-bug where www autolinks were being reported as
regular links instead of autolinks.
Introduce -m and -M, which allow metadata to be provided on the command
line. Metadata keys are first looked for in -m, overriden by what's in
the document, and those overridden by what's in -M.
Remove the deprecated -D, -d, -E, and -e, which were long ago replaced by
long options.
Inhibit printing of metadata in -Tgemini unless --gemini-metadata is given.
9c17f0be4d