Autoimport inserts at position 1 on failure, which could be in the middle of a module docstring

For example:

```python
"""
    This is a module
"""
foo = datetime.datetime.utcnow()
```
becomes
```python
"""
import datetime
    This is a module
"""
foo = datetime.datetime.utcnow()
```

Changing it to 0 ensures it is put at the absolute top of the file