update version -> 5.15

Author: sasagawa888

npl.h

@@ -17,7 +17,7 @@ address
  5,000,001 - 30,000,000  working area 
 30,000,001 - 32,000,000  variant area
 */
-#define VERSION     5.11
+#define VERSION     5.15
 //#define CELLSIZE    30000000  // if raspberry PI set smaller size.
 #define HEAPSIZE     5000000
 #define FREESIZE         500