README: minor clarifications for 0.3.0 behavior
README: minor clarifications for 0.3.0 behavior

ajahongir/ajax-datatables-rails,ajahongir/datatables-net,jbox-web/ajax-datatables-rails,ajahongir/ajax-datatables-rails,panmari/ajax-datatables-rails,adibsaad/ajax-datatables-rails,antillas21/ajax-datatables-rails,jbox-web/ajax-datatables-rails