Updated package name, function name in import in README.rst

Author: romilly

README.rst

@@ -66,8 +66,7 @@ Usage Example
     from displayio import Bitmap, Palette
     import adafruit_sdcard
     import storage
-    from adafruit_bitmap_saver import save_bitmap
-
+    from adafruit_bitmapsaver import save_pixels
     print('Setting up SD card')
     spi = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
     cs = digitalio.DigitalInOut(board.SD_CS)