LaTeX reader: be more forgiving in parsing command options.

This was needed, for example, to make some minted options work.

src/Text/Pandoc/Readers/LaTeX.hs

@@ -769,7 +769,7 @@ dolstinline = do
 keyval :: PandocMonad m => LP m (String, String)
 keyval = try $ do
   Tok _ Word key <- satisfyTok isWordTok
-  let isSpecSym (Tok _ Symbol t) = t `elem` [".",":","-","|","\\"]
+  let isSpecSym (Tok _ Symbol t) = t /= "]" && t /= ","
       isSpecSym _ = False
   optional sp
   val <- option [] $ do