Auto formatting includes '.venv' directory

[charliebudd]

Describe the bug
flake8 and isort are configured to ignore 'venv' not the also common '.venv' directory leading to false fails and corrupted virtual environments

To Reproduce
Steps to reproduce the behavior:

1. Setup dev environment with a virtual environment named '.venv'
2. run './runtests.sh --codeformat --nounittests'
3. tests will fail due to files in in the virtual environment folder

Expected behavior
virtual environment folder ignored by flake8 and isort

Additional context
'.venv' is a common naming convention and is skipped by isorts default settings...
https://pycqa.github.io/isort/docs/configuration/options/