Update maintainter email

Author: winkj

library.properties

@@ -1,7 +1,7 @@
 name=arduino-sht
 version=1.1.0
 author=Johannes Winkelmann, Andreas Brauchli
-maintainer=Andreas Brauchli <andreas.brauchli@sensirion.com>
+maintainer=Johannes Winkelmann <jwi@sensirion.com>
 sentence=Support for Sensirion's humidity and temperature sensors.
 paragraph=Supported sensors: SHTC1, SHTW1, SHTW2, SHT3x-DIS (I2C), SHT3x-ARP.
 category=Sensors