v2.2.0

v2.2.0 (April 30th, 2025)

• Drop support of PHP < 7.4
• Add isUnitDefined(), listAllUnits(), getOriginalValue(), and getOriginalUnit() methods to the Physical Quantity parent class
• Add new Power Physical Quantity
• Add Imperial Gallons to the Volume quantity
• Move to Github Actions, away from Travis CI
• Use Docker containers instead of Vagrant/VBox instances for dev environments
• Add local dev scripts for lint, test, and shell, in ./scripts/