TableParts: avoid name shadowing

HsLua now re-exports HsLua.Aeson, which contains a function `pushValue`;
that name should not be used.

Author: tarleb

src/Text/Pandoc/Lua/Marshal/TableParts.hs

@@ -99,7 +99,7 @@ peekTableBody = fmap (retrieving "TableBody")
 
 -- | Add a value to the table at the top of the stack at a string-index.
 addField :: LuaError e => Name -> LuaE e () -> LuaE e ()
-addField key pushValue = do
+addField key pushFieldValue = do
   pushName key
-  pushValue
+  pushFieldValue
   rawset (nth 3)