name 'get_dwl_storage_dir' not found

Hi!
When trying:

```
from marketools import Stock
pkn = Stock('PKN')
print(pkn.fundamentals)
```

I'm getting an error as in the title. Browsing briefly through the changes, it seems you have removed some of the "dwl" in the names over time. Maybe there are still some pieces of the code using the old name?
I have installled marketools via pip3.