message: Fix broken link in rnn_colorbot
  The README.md inside rnn_colorbot is broken, this fix fixes the link.
diff: @@ -23,4 +23,4 @@ Attribution-ShareAlike License and is available at
  https://en.wikipedia.org/wiki/List_of_colors:_N-Z
  This example was adapted from
  - https://github.com/random-forests/tensorflow-workshop/tree/master/extras/colorbot
  + https://github.com/random-forests/tensorflow-workshop/tree/master/archive/extras/colorbot
  