Include "-" in last name regexp.

collects/scriblib/autobib.rkt

@@ -189,7 +189,7 @@
   (if (author-element? a)
       a
       (let* ([s (content->string a)]
-             [m (regexp-match #px"^(.*) (\\p{L}+)$" s)])
+             [m (regexp-match #px"^(.*) (([\\-]|\\p{L})+)$" s)])
         (make-author-element
          #f
          (list a)

collects/scriblib/scribblings/autobib.scrbl

@@ -70,9 +70,9 @@ standard format.
 An element produced by a function like @scheme[author-name] tracks
 first, last names, and name suffixes separately, so that names can be
 ordered and rendered correctly. When a string is provided as an author
-name, the last non-empty sequence of ASCII alphabetic characters after
-a space is treated as the author name, and the rest is treated as the
-first name.}
+name, the last non-empty sequence of alphabetic characters or
+@litchar["-"] after a space is treated as the author name, and the
+rest is treated as the first name.}
 
 @defproc[(in-bib [orig bib?] [where string?]) bib?]{