sphinx fix; missed a bullet list woe

Author: sommersoft

adafruit_ds3231.py

@@ -43,7 +43,8 @@
 **Software and Dependencies:**
 
 * Adafruit CircuitPython firmware for the ESP8622 and M0-based boards:
-https://github.com/adafruit/circuitpython/releases
+  https://github.com/adafruit/circuitpython/releases
+
 * Adafruit's Register library: https://github.com/adafruit/Adafruit_CircuitPython_Register
 * Adafruit's Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice