Please add list_relevant_files for the None versioning system of the CLI.

[drazisil-codecov]

Please add list_relevant_files for the None versioning system of the CLI. It can't find repo files if git is not installed, resulting in a missing network.

[matt-codecov]

it looks like python's stdlib includes something for evaluating unix globbing https://docs.python.org/3/library/fnmatch.html. i'm not sure if gitignores are a custom flavor but we could probably write a directory walker with this that would respect most gitignores without requiring git