Bump to 1.2.1

Changes:
- Add support for custom TwoWire instance
- Allow installation via arduino-cli
- Add support for SHT85

library.properties

@@ -1,5 +1,5 @@
 name=arduino-sht
-version=1.2.0
+version=1.2.1
 author=Johannes Winkelmann, Andreas Brauchli
 maintainer=Johannes Winkelmann <jwi@sensirion.com>
 sentence=Support for Sensirion's humidity and temperature sensors.