Color documentation graph edges and add build date

Author: zbeekman

json-fortran.md

@@ -21,6 +21,9 @@ display: public
          private
 source: true
 graph: true
+coloured_edges: true
+print_creation_date: true
+creation_date: %Y-%m-%d %H:%M %z
 exclude_dir: tests
 extra_mods: iso_fortran_env:https://gcc.gnu.org/onlinedocs/gfortran/ISO_005fFORTRAN_005fENV.html
 md_extensions: markdown.extensions.toc(anchorlink=False)