title: get column index from prop in after change function of handsontable
body: <p>there is a problem getting the column index in after change function of Handsontable, in old versions it was much clear than now, in this function parameter changes gives out:<br>
  2D array containing information about each of the edited cells [[row, prop, oldVal, newVal], ...] but where is the COLUMN!?</p>
  
  <p>thank you all for help!</p>