Adding support for G5 EGVRecord sizes

Author: loudnate

dexcom_reader/database_records.py

@@ -278,15 +278,15 @@ class EGVRecord(GenericTimestampedRecord):
   # uint, uint, ushort, byte, ushort
   # (system_seconds, display_seconds, glucose, trend_arrow, crc)
   FIELDS = ['glucose', 'trend_arrow']
-  FORMAT = '<2IHcH'
+  FORMAT = '<2IHBBBBBBBBBcBH'
 
   @property
   def full_glucose(self):
     return self.data[2]
 
   @property
   def full_trend(self):
-    return self.data[3]
+    return self.data[12]
 
   @property
   def display_only(self):