Bump version number to 1.2.3

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit Si4713 Library
-version=1.2.1
+version=1.2.3
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Arduino library for the Si4714 FM+RDS Transmitter in the Adafruit shop