Updated readme to reflect changes.

Chris--A · Jul 13, 2015 · b2af6d6 · b2af6d6
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 **Authors:**  *Mark Stanley***,** *Alexander Brevig*
 
 
-This repository is a copy of the code found here [[Arduino Playground]](http://playground.arduino.cc/Code/Keypad).
+This repository is a copy of the code found here [[Arduino Playground]](http://playground.arduino.cc/Code/Keypad).
+
+The source and file structure has been modified to conform to the newer `1.5r2` library specification and is not compatible with legacy IDE's.
+For these IDE's, visit the link above to grab the pre `1.0` compatible version, or download it directly here:  [[pre `1.0` version]](http://playground.arduino.cc/uploads/Code/keypad.zip).