Issue #409: csv importer crashes on Python 3.8 (blais/beancount)

[Toke Høiland-Jørgensen]

New issue 409: csv importer crashes on Python 3.8
https://bitbucket.org/blais/beancount/issues/409/csv-importer-crashes-on-python-38

Toke Høiland-Jørgensen:

When trying to use the csv ingester with Python 3.8, I get a crash with a traceback ending in this:

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```
File "/usr/lib/python3.8/site-packages/beancount/ingest/importers/csv.py", line 162, in __init__
super().__init__(**kwds)
File "/usr/lib/python3.8/site-packages/beancount/ingest/importers/mixins/identifier.py", line 65, in __init__
super().__init__(**kwds)
File "/usr/lib/python3.8/site-packages/beancount/ingest/importers/mixins/filing.py", line 30, in __init__
super().__init__(**kwds)
TypeError: object.__init__() takes exactly one argument (the instance to initialize)
```

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It seems it is no longer possible to just blindly pass up args to \_\_init\_\_ like that.

I’ve locally patched the init method of FilingMixin to do this instead, which seems to work:

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```python
if isinstance(super(), importer.ImporterProtocol):
super().__init__(**kwds)
```

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