doc: Generate the man page from markdown

Because who wants to hand-write groff markup these days?

This adds pandoc(1) as a build-dependency.

It uses PHP Markdown Extra definition lists, which pandoc uses for e.g.
command option/explanation lists. Because this definition list format is
non-standard it might not render as intended on many markdown viewers,
but pandoc generates "better" man page output with it.

1 files changed, 1 insertions, 0 deletions

diff --git a/README b/README
index 02b0545..d5a9393 100644
--- a/README
+++ b/README
@@ -53,6 +53,7 @@ Requirements
 - Linux
 - GNU make
 - C99 compiler, like gcc or clang
+- pandoc
 - libbsd