Update zkrq_service.py
Update zkrq_service.py

Every python function returns `None` by default. You should write your functions to avoid having a `return` statement before the end. Obviously sometimes it's much easier to have a quick check to return early on.

If you're going to use `.format()`, you should use the keyword arguments. Such as:

```python
logger.debug('{kill_id} zkrq returned'.format(kill_id=parsed_response['package']['killID']))
```

However the new standard is using f string literals. `'f{parsed_response['package']['killID']} zkrq returned'`
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