Add line after bullet list in module docstring

Author: tekktrik

adafruit_esp32spi/digitalio.py

@@ -9,6 +9,7 @@
 
 * Author(s): Brent Rubell, based on Adafruit_Blinka digitalio implementation
 and bcm283x Pin implementation.
+
 https://github.com/adafruit/Adafruit_Blinka/blob/master/src/adafruit_blinka/microcontroller/bcm283x/pin.py
 https://github.com/adafruit/Adafruit_Blinka/blob/master/src/digitalio.py
 """