Update 'README.md'

README.md

 	* 9 `Horse` across 3 `Stable`.
 	* 2 `FarmVehicle`
 	* 1 `Aircraft`
-	* His sister, `Froilanda`, is a `Pilot`, who uses a `CropDuster`. She is not a `Farmer`.
+	* His sister, `Froilanda`, is a `Pilot`, who uses a `CropDuster`. She cannot drive a `Tractor`.
 	* His brother, `Freelan`, is a `Pilot` and a `Farmer`.