- Drop support for EOL Python <2.7 and 3.2-3.3
- Check for unused exception binding in `except:` block
- Handle string literal type annotations
- Ignore redefinitions of `_`, unless originally defined by import
- Support `__class__` without `self` in Python 3
- Issue an error for `raise NotImplemented(...)`

- Process function scope variable annotations for used names
- Find Python files without extensions by their shebang