Use EN DASH characters directly in Web page, without entities

Use EN DASH characters directly in Web page, without entities

The W3C HTML 5 checker objects to my use of "–" and I can't see
any reason why I should use it.  The page is unashamedly in UTF-8, so
there's not much benefit to singling out this one character for special
treatment.

The page is still officially in XHTML 1.0 Strict at the moment, but I
might want to change that, which is why I'm paying attention to an
HTML 5 checker.