pandoc-quotes: use text to access Str element content

Pandoc 2.15 changed the marshalling method; the undocumented `.c`
field no longer gives access to the text content.

Author: tarleb

latex-hyphen/latex-hyphen.lua

@@ -64,7 +64,7 @@ function split_hyphen(inputstr)
 end
 
 function Str(elem)
-  local parts = split_hyphen(elem.c)
+  local parts = split_hyphen(elem.text)
   -- if not more than one part, string contains no hyphen, return unchanged.
   if #parts <= 1 then
     return nil