chore(README): update license

Author: ajoslin

README.md

@@ -147,4 +147,4 @@ angular.module('myApp', ['ajoslin.promise-tracker'])
 
 ## <a id="license"></a>License
 
-> <a rel="license" href="http://creativecommons.org/publicdomain/mark/1.0/"> <img src="http://i.creativecommons.org/p/mark/1.0/80x15.png" style="border-style: none;" alt="Public Domain Mark" /> </a> <span property="dct:title">angular-promise-tracker</span> by <a href="http://andybam.com" rel="dct:creator"><span property="dct:title">Andy Joslin</span></a> is free of known copyright restrictions.
+> <a rel="license" href="http://creativecommons.org/publicdomain/mark/1.0/"> <img src="http://i.creativecommons.org/p/mark/1.0/80x15.png" style="border-style: none;" alt="Public Domain Mark" /> </a> <span property="dct:title">angular-promise-tracker</span> by <a href="http://ajoslin.com" rel="dct:creator"><span property="dct:title">Andy Joslin</span></a> is free of known copyright restrictions.