Update SD.h

Author: tobozo

libraries/SD/src/SD.h

@@ -32,6 +32,8 @@ class SDFS : public FS
     void end();
     sdcard_type_t cardType();
     uint64_t cardSize();
+    size_t numSectors();
+    size_t sectorSize();
     uint64_t totalBytes();
     uint64_t usedBytes();
     bool readRAW(uint8_t* buffer, uint32_t sector);