Merge pull request #96 from triplepoint/feature/release_prep

changelog update

Author: triplepoint

CHANGELOG.md

@@ -1,6 +1,11 @@
-## v2.2.0 (xxx)
-
-- Drop support of php < 7.4
+## 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/`
 
 ## v2.1.0 (July 24th, 2016)
 - Added getUnitDefinitions() method to PhysicalQuantity classes, to get a raw list of UnitofMeasure objects defined on that quantity