4.0.0: Add DateRestrictions

• Add DateRestrictions (#94)
• Add black/isort/mypy in pypoetry, but ensure their versions are synchronized with pre-commit (#93)

And

• Dependencies auto-upgrade (#91, #89, #90, #86, #88, #83, #82, #81, #80, #79, #78, #77, #76, #75, #74, #73, #71)