added comment to credit @tomgidden for his contribution on which the invert function is based

Author: improti

Adafruit_LEDBackpack/Adafruit_7Segment.py

@@ -29,6 +29,8 @@ class SevenSegment:
   # Hexadecimal character lookup table (row 1 = 0..9, row 2 = A..F)
   DIGITS_NORMAL = [ 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, \
                     0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 ]
+  # inverted table from https://github.com/tomgidden/Adafruit-Raspberry-Pi-Python-Code/commit/87bed18ecc8e251f3c10433d8a31d363dbbd355c
+  # thx to tomgidden@github for this
   DIGITS_INVERTED = [ 0x3F, 0x30, 0x5B, 0x79, 0x74, 0x6D, 0x6F, 0x38, 0x7F, 0x7D, \
                       0x7E, 0x67, 0x0F, 0x73, 0x4F, 0x4E ]
   digits = DIGITS_NORMAL