Fixed Link formatting in License file.

LICENSE.md

@@ -4,7 +4,7 @@ Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this software except in compliance with the License,
 as included below.
 
-Please note that this project uses the [[Highcharts and Highstock|http://www.highcharts.com/]] 
+Please note that this project uses the [Highcharts and Highstock](http://www.highcharts.com/)
 charting libraries, which are *not* open source.  Please see the 
 [Licensing Page](http://shop.highsoft.com/highcharts.html) and the 
 [Licensing FAQ](http://shop.highsoft.com/faq#licensing-faq) for these products to ensure that