Update README.md

Author: wwayne

README.md

@@ -51,7 +51,7 @@ Global|Specific	|Type	|Values  |  Description
  type	|   data-type  |  String  |  success, warning, error, info, light | theme
  effect|   data-effect  |  String  |  float, solid | behaviour of tooltip
  event |   data-event  |  String  |  e.g. click | custom event to trigger tooltip
- eventOff |   data-event-off  |  String  |  e.g. click | custom event to hide tooltip
+ eventOff |   data-event-off  |  String  |  e.g. click | custom event to hide tooltip (only makes effect after setting event attribute)
  globalEventOff | | 'string'| e.g. click| global event to hide tooltip (global only)
  isCapture | data-iscapture | Bool | true, false | when set to ture, custom event's propagation mode will be capture
  offset	|   data-offset  |  Object  |  top, right, bottom, left | `data-offset="{'top': 10, 'left': 10}"` for specific and `offset={{top: 10, left: 10}}` for global