Documents all breaking changes in 4.0 for both the Python library and CLI:
- db["name"] only returns tables, not views
- Default float type changed to REAL
- convert() no longer skips False values
- Table schemas use double quotes
- Upsert uses modern SQLite syntax
- Type detection now default for CSV/TSV import
- sqlite-utils tui moved to plugin
- Python 3.10+ required
