Fixes typo on README.
Fixes typo on README.

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