Updated SNR indication method

LoRa.h

@@ -1,5 +1,8 @@
 // Copyright (c) Sandeep Mistry. All rights reserved.
-// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+// Licensed under the MIT license.
+
+// Modifications and additions copyright 2018 by Mark Qvist
+// Obviously still under the MIT license.
 
 #ifndef LORA_H
 #define LORA_H
@@ -29,6 +32,7 @@ public:
   int parsePacket(int size = 0);
   int packetRssi();
   uint8_t packetRssiRaw();
+  uint8_t packetSnrRaw();
   float packetSnr();
   long packetFrequencyError();