Update library.properties - bump version to 1.12.1

library.properties

@@ -1,5 +1,5 @@
 name=Adafruit GFX Library
-version=1.12.0
+version=1.12.1
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Adafruit GFX graphics core library, this is the 'core' class that all our other graphics libraries derive from.