Update README.md

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 the [Apache 2 Licence](LICENCE.txt).
+the the [Apache 2 Licence](https://www.apache.org/licenses/LICENSE-2.0.html).
 
 [![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)