fix spec for specific nokogiri version
fix spec for specific nokogiri version

sadaf2605/datagrid,jeanlinux/datagrid,bogdan/datagrid,bogdan/datagrid,reenhanced/datagrid,artofhuman/datagrid,jeanlinux/datagrid,sadaf2605/datagrid,11factory/datagrid,artofhuman/datagrid,reenhanced/datagrid