Add documentation about filterList in the filterOptions section

Should help to clear up confusion that filterList must be array of arrays, which is the same type as the filterList in the main column options

README.md

@@ -231,7 +231,7 @@ const columns = [
 |**`empty`**|boolean|false|This denotes whether the column has data or not (for use with intentionally empty columns)
 |**`viewColumns`**|boolean|true|Allow user to toggle column visibility through 'View Column' list
 |**`filterList`**|array||Filter value list [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/column-filters/index.js)
-|**`filterOptions`**|{names, logic, display}||(These options affect the filter display and functionality from the filter dialog. To modify the filter chips that display after selecting filters, see `customFilterListOptions`) With filter options, it's possible to use custom names for the filter fields [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/column-filters/index.js), custom filter logic [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/customize-filter/index.js), and custom rendering [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/customize-filter/index.js)
+|**`filterOptions`**|{names, logic, display(filterList, onChange(filterList, index, column), index, column)}||(These options affect the filter display and functionality from the filter dialog. To modify the filter chips that display after selecting filters, see `customFilterListOptions`) With filter options, it's possible to use custom names for the filter fields [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/column-filters/index.js), custom filter logic [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/customize-filter/index.js), and custom rendering [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/customize-filter/index.js). `filterList` must be of the same type in the main column options, that is an array of arrays, where each array corresponds to the filter list for a given column.
 |**`customFilterListRender` DEPRECATED (use `customFilterListOptions`)**|function||Function that returns a string or array of strings used as the chip label(s). `function(value) => string OR arrayOfStrings` [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/column-filters/index.js)
 |**`customFilterListOptions`**|{render: function, update: function}|| (These options only affect the filter chips that display after filters are selected. To modify the filters themselves, see `filterOptions`) `render` returns a string or array of strings used as the chip label(s). `function(value) => string OR arrayOfStrings`, `update` returns a `filterList (see above)` allowing for custom filter updates when removing the filter chip [Example](https://github.com/gregnb/mui-datatables/blob/master/examples/column-filters/index.js)
 |**`filter`**|boolean|true|Display column in filter list