Fixed some libraries metadata.

cmaglie · cmaglie · commit 9c42ab3ea749 · 2015-01-16T12:22:24.000+01:00
diff --git a/library.properties b/library.properties
@@ -4,5 +4,6 @@ author=Arduino
 maintainer=Arduino <info@arduino.cc>
 sentence=Enables GSM/GRPS network connection using the Arduino GSM Shield. For all Arduino boards BUT Arduino DUE.
 paragraph=Use this library to make/receive voice calls, to send and receive SMS with the Quectel M10 GSM module.</br>This library also allows you to connect to internet through the GPRS networks. You can either use web Clients and Servers.</br>
+category=Communication
 url=http://arduino.cc/en/Reference/GSM
 architectures=avr
