Updated README to indicate support for the Arduino UNO R4

Author: MHeironimus

README.md

@@ -1,7 +1,7 @@
 # Arduino Joystick Library
 #### Version 1.1.0
 
-Arduino IDE 1.6.7 (or above) library that adds a joystick to the list of HID devices an Arduino Leonardo or Arduino Micro (or any Arduino clone that is based on the ATmega32u4) can support. This will not work with Arduino IDE 1.6.6 (or below).
+Arduino IDE 1.6.7 (or above) library that allows an Arduino Leonardo, Arduino Micro, or Arduino UNO R4 (or theoretically any Arduino board or clone that supports USB capabilities) to act as a joystick. This will not work with Arduino IDE 1.6.6 or below.
 
 This is a legacy version of this library that has a fixed configuration. The latest version of this library, which supports a dynamic configuration, can be found at [https://github.com/MHeironimus/ArduinoJoystickLibrary](https://github.com/MHeironimus/ArduinoJoystickLibrary).