fix #84

Author: hathach

README.md

@@ -109,7 +109,7 @@ You must have have  a J-Link available to "unbrick" your device.
 Prerequisites
 
 - ARM GCC
-- Nordic's [nRF5x Command Line Tools](http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.tools%2Fdita%2Ftools%2Fnrf5x_command_line_tools%2Fnrf5x_installation.html)
+- Nordic's [nRF5x Command Line Tools](https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Command-Line-Tools)
 
 To build: