Update README.md

Updated AL2 link

Author: keilw

README.md

@@ -10,7 +10,7 @@ Or the GitHub page:
 http://javamoney.github.io/ri.html
 
 The current module contains the reference implementation of JSR 354, licenced under
-the Apache 2 Licence, see ./LICENCE.html.
+the the [Apache 2 Licence](./LICENCE.txt).
 
 [![Build Status](https://api.travis-ci.org/JavaMoney/jsr354-ri.png?branch=master)](https://travis-ci.org/JavaMoney/jsr354-ri)
 [![Coverage Status](https://coveralls.io/repos/JavaMoney/jsr354-ri/badge.png)](https://coveralls.io/r/JavaMoney/jsr354-ri)