Inconsistent function of the update functionality

[Strainy]

Great work on this wrapper. It's really useful!

I just noticed a small issue today. It seems that when receiving the callback from the update or the update_id function I get the entire database returned rather than just the updated record.

So for example, this code:

var _CacheIndex = new RNDBModel.create_db("testCache");

// create some data...

this._CacheIndex.update({key}, {key, value, expiry}, (data) => {
   console.log(data);
}

Will print out the following object to the logs:

Object
  testCache: Object
    autoinc: 24
    rows: Object
    totalrows: 1

I'd expect it to just return the row I submitted, similar to how the add and remove callbacks function.