Blackbricks

Fix

- avoid failing on quoted cell dividers

Resolve buf where blackbricks removed sql code on the same line as the `%sql` magic. See 32.

Bumping dependencies to resolve dependabot alert. See 30.

Non-functional patch with minor documentation updates.

Fix

- respect `insecure` option in .databrickscfg (28)
- restore Python 3.8 compatibility
- handle trailing whitespace the same as Databricks
- add strict mypy typing to project
- ignore non-text files

Feat

- recursively discover remote notebooks
- remove option for two-space indentation

BREAKING CHANGE

Removal of two-space indentation as an option and the change to forcing the PEP-8 compliant four-space indentation.

See [25](https://github.com/inspera/blackbricks/pull/25) for background.

Feat

- deprecate two-space indentation