-[CHANGED] Throw if `dialect` is not provided to the constructor
-[CHANGED] Throw `bluebird.AggregateError` instead of array from `bulkCreate` when validation fails
-[FIXED]`$notIn: []` is now converted to `NOT IN (NULL)`[#4859](https://github.com/sequelize/sequelize/issues/4859)
## BC breaks:
-`hookValidate` removed in favor of `validate` with `hooks: true | false`. `validate` returns a promise which is rejected if validation fails
- Removed support for `referencesKey`, use a `references` object
- Remove default dialect
- When `bulkCreate` is rejected because of validation failure it throws a `bluebird.AggregateError` instead of an array. This object is an array-like so length and index access will still work, but `instanceof` array will not
-`$notIn: []` will now match all rows instead of none
# 3.23.2
-[FIXED] Type validation now works with non-strings due to updated validator@5.0.0 [#5861](https://github.com/sequelize/sequelize/pull/5861)
