Update colorblindfriendly.py

I had a typo in one of the colors, and also realized that the decimal numbers given on the [J*FLY website](http://jfly.iam.u-tokyo.ac.jp/html/color_blind/#pallet) weren't equivalent to the more precise 0-255 RGB integer values, so I switch to using those.  I also put the colors into a tuple so the new colors could be set programmatically.