Undefined method "getNativeConnection" of class "Doctrine\DBAL\Connection"

Hi!

With `doctrine/dbal v2.13.9` and `codeception/module-doctrine v3.1.0 ` I got an error:
```
Attempted to call an undefined method named "getNativeConnection" of class "Doctrine\DBAL\Connection".
Did you mean to call "getWrappedConnection"?
```

Please fix `codeception/module-doctrine` to support **old** version of Doctine DBAL **2**.

