v1.1.6

• Drop Python 3.6 and Python 3.7 support.
• Use obj.model_dump instead of obj.dict for Pydantic V2.
• Add support for Decimal in FriendlyEncoder.
• Apply black, flake8, isort, mypy.
• Replace setup.py with pyproject.toml.
• Workflow maintenance.

Contributors: @waketzheng, @tyzhnenko, @RobertoPrevato