Commented on io value update

After creating a value list I update the last item to itself be a list of
items. This is so it may hold binary data for IO.

aprslib/packets/telemetry.py

@@ -4,7 +4,7 @@ class TelemetryReport(APRSPacket):
     format = 'raw'
     telemetry = dict(seq=0,
                      vals=['0']*6)
-    telemetry['vals'][5] = ['1']*8
+    telemetry['vals'][5] = ['1']*8  # Replace io data with list of 8 values
     comment = ''
 
     def _serialize_body(self):