Transactions are broken on v3.0.1

# Description/Steps to reproduce
This works fine in 3.0.0 but not in 3.0.1
```
this.beginTransaction( 'READ COMMITTED', ( err, tx )=>{
  this.updateAll( { foo: 'bar' },  { foo: 'bar2'},  { transaction: tx },
  ( err )=>{
    // err is Transaction is not active.
  }
}
```