🚀 go-pugleaf

Here's a small fix to Robert Marks's cool .DI drop-initial macro.
The macro initially translates ~ to space but never restores
it---so in his sample paragraph (and any text after it), ~ prints
as space instead of ~.

The fix is simple:  just before the ".." that ends the .DI macro,
insert two lines:

	.\" Allow ~ to be printed in subsequent text.
	.tr ~~

The line right after ".tr ~~" should be the ".." closing request.

Thanks, Robert, for a great macro!