README.md: remove license badge, because github now displays the license at the top

Author: PascalSchumacher

README.md

@@ -45,7 +45,6 @@ Apache Commons IO
 
 [![Build Status](https://travis-ci.org/apache/commons-io.svg?branch=master)](https://travis-ci.org/apache/commons-io)
 [![Coverage Status](https://coveralls.io/repos/github/apache/commons-io/badge.svg?branch=master)](https://coveralls.io/github/apache/commons-io?branch=master)
-[![License](http://img.shields.io/:license-apache-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)
 
 The Apache Commons IO library contains utility classes, stream implementations, file filters, 
 file comparators, endian transformation classes, and much more.