docs: fix typo in README

Author: Claudéric Demers

README.md

@@ -102,7 +102,7 @@ There are already a number of great Drag & Drop libraries out there (for instanc
 | helperClass                       | String                                                    |                                                                                                                | You can provide a class you'd like to add to the sortable helper to add some styles to it                                                                                                                                                                                                                                                                                                                                                                              |
 | transitionDuration                | Number                                                    | `300`                                                                                                          | The duration of the transition when elements shift positions. Set this to `0` if you'd like to disable transitions                                                                                                                                                                                                                                                                                                                                                     |
 | keyboardSortingTransitionDuration | Number                                                    | `transitionDuration`                                                                                           | The duration of the transition when the helper is shifted during keyboard sorting. Set this to `0` if you'd like to disable transitions for the keyboard sorting helper. Defaults to the value set for `transitionDuration` if undefined                                                                                                                                                                                                                               |
-| keyCodes                           | Array<Number>                                             | `{`<br/>&nbsp;&nbsp;`lift: [32],`<br/>&nbsp;&nbsp;`drop: [32],`<br/>&nbsp;&nbsp;`cancel: [27],`<br/>&nbsp;&nbsp;`up: [38, 37],`<br/>&nbsp;&nbsp;`down: [40, 39]`<br/>`}`                                                                                                                        | A object, containing an array of keycodes for each keyboard-accessible action.                                                                                                                                                                                                                                                                   |
+| keyCodes                           | Array<Number>                                             | `{`<br/>&nbsp;&nbsp;`lift: [32],`<br/>&nbsp;&nbsp;`drop: [32],`<br/>&nbsp;&nbsp;`cancel: [27],`<br/>&nbsp;&nbsp;`up: [38, 37],`<br/>&nbsp;&nbsp;`down: [40, 39]`<br/>`}`                                                                                                                        | An object containing an array of keycodes for each keyboard-accessible action.                                                                                                                                                                                                                                                                   |
 | pressDelay                        | Number                                                    | `0`                                                                                                            | If you'd like elements to only become sortable after being pressed for a certain time, change this property. A good sensible default value for mobile is `200`. Cannot be used in conjunction with the `distance` prop.                                                                                                                                                                                                                                                |
 | pressThreshold                    | Number                                                    | `5`                                                                                                            | Number of pixels of movement to tolerate before ignoring a press event.                                                                                                                                                                                                                                                                                                                                                                                                |
 | distance                          | Number                                                    | `0`                                                                                                            | If you'd like elements to only become sortable after being dragged a certain number of pixels. Cannot be used in conjunction with the `pressDelay` prop.                                                                                                                                                                                                                                                                                                               |