Updated arduino library properties

Author: blemasle

library.properties

@@ -2,9 +2,9 @@ name=SIM808
 version=1.0.0
 author=Bertrand Lemasle
 maintainer=Bertrand Lemasle
-sentence=Library for using a SIM808 GSM/GPRS modem and GPS.
+sentence=Straightforward Arduino library for the SIM808
 paragraph=Provides easy access to several SIM808 features, including HTTP(s) GET & POST, sending SMS and GPS positioning.
 category=Device Control
-url=https://github/blemasle/SIM808
+url=https://github.com/blemasle/arduino-sim808
 architectures=*
 includes=SIM808.h