Small update and mistake

[GitJer]

I realize that this repository is very old, but I needed something quick, and this suited my needs. Not that I expect any changes to be made, but I have two small issues, both in "max7219test_scrol.ino".

Since some time the use of 'prog_uchar' (line 29) has changed to 'const unsigned char'.

There is a small mistake in the example strings on lines 138 and 139. The 'X' and 'W' have the incorrect order.

[christlighty]

Please send me the zip files to olatundepeter6@gmail.com