fix(code actions): don't sort actions by title (#63)

Not all code action sources want their actions to be sorted
alphabetically.

The source itself should determine the order of the actions by how they
add them to the return table.

See: #62

lua/null-ls/code-actions.lua

@@ -34,11 +34,6 @@ M.handler = function(method, original_params, handler)
             callback = function(actions)
                 log:trace("received code actions from generators")
                 log:trace(vim.inspect(actions))
-
-                -- sort actions by title
-                table.sort(actions, function(a, b)
-                    return a.title < b.title
-                end)
                 handler(actions)
             end,
         })