trivial: Show the help text when starting appstream-builder with no arguments
trivial: Show the help text when starting appstream-builder with no arguments

ximion/appstream-glib,ximion/appstream-glib,kalev/appstream-glib,mitya57/appstream-glib,superm1/appstream-glib,superm1/appstream-glib,ximion/appstream-glib,mitya57/appstream-glib,ikeydoherty/appstream-glib,hughsie/appstream-glib,ikeydoherty/appstream-glib,kalev/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib