4.4.0-protobi.5

Fork release v4.4.0-protobi.1

Features:
- Multiple pivot tables support (#1) - Previously limited to one per file
- Comprehensive pivot table documentation
- Write-only implementation (reading not yet supported)

Based on upstream exceljs/exceljs v4.4.0

Release v4.4.1

4.4.0

4.3.0

4.2.1

4.2.0

4.1.1

4.1.0

4.0.1