Bump to v0.27.3 release-version, update Changelog

Author: bouwew

CHANGELOG.md

@@ -1,5 +1,7 @@
 # Changelog
 
+# v0.27.3 More typing improvements
+
 # v0.27.2: Strict-typing
 
 # v0.27.1: More cooling-related updates, based on additional info from Plugwise

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name            = "plugwise"
-version         = "0.27.2"
+version         = "0.27.3"
 license         = {file = "LICENSE"}
 description     = "Plugwise Smile (Adam/Anna/P1), Stretch and USB (Stick) module for Python 3."
 readme          = "README.md"