Move ref to SO to LICENSE section

Author: zoffixznet

README.md

@@ -166,3 +166,4 @@ files indicate the copyright and license terms at the top of the file. Currently
 * [jQuery Cookie plugin](https://github.com/js-cookie/js-cookie):
   Copyright 2006, 2015 Klaus Hartl & Fagner Brack;
   [MIT License](http://creativecommons.org/licenses/MIT)
+* Examples from Stack Overflow [MIT License](http://creativecommons.org/licenses/MIT); ([ref #1](http://stackoverflow.com/a/43669837/215487) for [1f7cc4e](https://github.com/perl6/doc/commit/1f7cc4efa0da38b5a9bf544c9b13cc335f87f7f6))