-[INTERNALS] Deprecate migration logic. This is now implemented in [umzug](https://github.com/sequelize/umzug) and the [CLI](https://github.com/sequelize/cli).
-[BUG] Fixed various inconsistencies with `Instance.update` and how it behaves together with `create`, `fields` and more.
-[BUG] Fixed crash/bug when using `include.where` together with `association.scope`
-[BUG] Fixed support for `Instance.destroy()` and `field` for postgres.
#### Backwards compatability changes
- Some of the string error messages for connection errors have been replaced with actual error instances. Checking for connection errors should now be more consistent.
