update README.md

Author: altjz

README.md

@@ -20,11 +20,10 @@ Specification Please read Documentation Center /API
  If you don't know how to upload Arduino sketch,  We recommend you read this [Arduino Getting Started on Windows][397d20eb] or [Arduino Getting Started on MacOS][2d8a8b7a]
 - You need to recalibrate when you are new to this library. we recommend the GUI Calibration tool.   
 
-  [2d8a8b7a]: https://www.arduino.cc/en/Guide/MacOSX "Arduino Getting Started on MacOS"
 
 
 ### Manual Installation
-  
+
 - Download [Arduino IDE][622f1188]  
 - Clone the source code into your computer.
 - Open Arduino IDE, import the zip as library. Please refer this [Import a .zip Library][8cd4af00]
@@ -37,3 +36,4 @@ Specification Please read Documentation Center /API
   [3]: http://developer.ufactory.cc/quickstart/arduino/
   [622f1188]: https://www.arduino.cc/en/Main/Software "Arduino IDE"
   [397d20eb]: https://www.arduino.cc/en/Guide/Windows "Arduino Getting Start on Windows"
+  [2d8a8b7a]: https://www.arduino.cc/en/Guide/MacOSX "Arduino Getting Started on MacOS"