doctest

Is there a how-to guide to write my own tool? I want to do some conditional stripping/modifying (e.g. insert a Python script into a cell) for a Kaggle notebook. I've been playing around for an hour and I've sort-of-got a tool working, but I can't get nbqa to pass in anything I can read. In my code sys.argv has the original Notebook filename and if I rewrite that, nbqa throws an exception.k

Describe the feature you'd like
Because byexample runs on Python 3 only, these __future__ imports (unicode_literals and print_function) are not needed anymore as they are the default.
Removing them will make the code a little cleaner.

When removing the imports from the examples/test, extra care should be taken to not break them or to hide some under-testing thing.