Bump to v0.21.0 (#100)

This is a breaking change: The WasherDryer class is not split into
separate Washer and Dryer classes.

Author: abmantis

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "whirlpool_sixth_sense"
-version = "0.20.0"
+version = "0.21.0"
 license = "MIT"
 authors = [{ name = "Abílio Costa", email = "[email protected]" }]
 description = "Unofficial API for Whirlpool's 6th Sense appliances"