install the manpage

Author: rgrinberg

bin/dune

@@ -3,3 +3,12 @@
  (public_name mustache)
  (modules mustache_cli)
  (libraries mustache ezjsonm cmdliner))
+
+(rule
+ (with-stdout-to mustache.1
+  (run mustache --help=groff)))
+
+(install
+ (section man)
+ (package mustache)
+ (files mustache.1))