Increase firmware version

Author: nseidle

Firmware/RTK_Surveyor/RTK_Surveyor.ino

@@ -39,7 +39,7 @@
 */
 
 const int FIRMWARE_VERSION_MAJOR = 1;
-const int FIRMWARE_VERSION_MINOR = 5;
+const int FIRMWARE_VERSION_MINOR = 6;
 
 #define COMPILE_WIFI //Comment out to remove all WiFi functionality
 #define COMPILE_BT //Comment out to disable all Bluetooth