Change ASCII "I" to make easier to read (Suggestion)

[BKeyport]

• Arduino board: N/A

• Arduino IDE version (found in Arduino -> About Arduino menu): N/A

• List the steps to reproduce the problem below (if possible attach a sketch or copy the sketch code in too):

Please change the binary in Adafruit_LEDBackpack.cpp as follows:

Replace 0b0001001000000000, // I with 0b0001001000001001, // I

This produces a capital I with serif so that it's easier to tell it between I and 1.

Anyone that stumbles across this could do it themselves, but I figure it might as well be in the default code.

[ladyada]

hi sounds good, please submit a PR!