Version 0.0.4 uploaded to pip raises an error when trying to import tibber

In version 0.0.4 uploaded to pip, importing tibber results in a "ModuleNotFoundError: No module named 'tibber.networking'".

Recreation: 
```bash
> python setup.py install
> cd .. # Change directory so we don't import locally, but use the version installed with setup.py
> python
>>> import tibber # error
```