changed to use .. code-block

Author: mrmcwethy

README.rst

@@ -34,39 +34,39 @@ This is easily achieved by downloading
 Usage Example
 =============
 
-```
-import busio
-import digitalio
-from board import SCK, MOSI, MISO, D2, D2
-
-from adafruit_rgb_display import color565
-import adafruit_rgb_display.ili9341 as ili9341
-
-
-# Configuration for CS and DC pins:
-CS_PIN = D2
-DC_PIN = D3
-
-# Setup SPI bus using hardware SPI:
-spi = busio.SPI(clock=SCK, MOSI=MOSI, MISO=MISO)
-
-# Create the ILI9341 display:
-display = ili9341.ILI9341(spi, cs=digitalio.DigitalInOut(CS_PIN),
-                          dc=digitalio.DigitalInOut(DC_PIN))
-
-# Main loop:
-while True:
-    # Clear the display
-    display.fill(0)
-    # Draw a red pixel in the center.
-    display.pixel(120, 160, color565(255, 0, 0))
-    # Pause 2 seconds.
-    time.sleep(2)
-    # Clear the screen blue.
-    display.fill(color565(0, 0, 255))
-    # Pause 2 seconds.
-time.sleep(2)
-```
+.. code-block:: python
+
+  import busio
+  import digitalio
+  from board import SCK, MOSI, MISO, D2, D2
+
+  from adafruit_rgb_display import color565
+  import adafruit_rgb_display.ili9341 as ili9341
+
+
+  # Configuration for CS and DC pins:
+  CS_PIN = D2
+  DC_PIN = D3
+
+  # Setup SPI bus using hardware SPI:
+  spi = busio.SPI(clock=SCK, MOSI=MOSI, MISO=MISO)
+
+  # Create the ILI9341 display:
+  display = ili9341.ILI9341(spi, cs=digitalio.DigitalInOut(CS_PIN),
+                            dc=digitalio.DigitalInOut(DC_PIN))
+
+  # Main loop:
+  while True:
+      # Clear the display
+      display.fill(0)
+      # Draw a red pixel in the center.
+      display.pixel(120, 160, color565(255, 0, 0))
+      # Pause 2 seconds.
+      time.sleep(2)
+      # Clear the screen blue.
+      display.fill(color565(0, 0, 255))
+      # Pause 2 seconds.
+  time.sleep(2)
 
 API Reference
 =============