Fixes URL field length

Author: SuGlider

libraries/BLE/src/BLEEddystoneURL.h

@@ -35,7 +35,7 @@ class BLEEddystoneURL {
 	struct {
 		uint8_t frameType;
 		int8_t  advertisedTxPower;
-		uint8_t url[16];
+		uint8_t url[18];  // 18 bytes: 1 byte for URL scheme + up to 17 bytes of URL
 	} __attribute__((packed)) m_eddystoneData;
 
 }; // BLEEddystoneURL