update README

Author: ntruchsess

README

@@ -28,7 +28,7 @@ On a Mac, you will want to create a folder named "libraries" in in the "Document
 
 Or you download the zipped version of the library from https://github.com/ntruchsess/arduino_uip/releases, and copy the contained directory UIPEthernet to [path to Arduino distribution]\libraries\UIPEthernet.
 
-If you are running Arduino-IDE 1.5.x use release-version 1.57 or checkout branch 'Arduino_1.5.5'
+If you are running Arduino-IDE 1.5.x use release-version 1.59 or checkout branch 'Arduino_1.5.x'
 
 Additional information can be found on the Arduino website: http://www.arduino.cc/en/Hacking/Libraries