Update maven central badge

The badge default links to the old artifact 20041127.091804.

The badge can be fixed using ?gav=true parameter.

Use explicit link to the artifact in maven as the redirect does not
support the gav=true parameter for semantic versioning, i.e. this does
not work:

https://maven-badges.herokuapp.com/maven-central/commons-codec/commons-codec?gav=true

Author: aherbert

README.md

@@ -20,6 +20,9 @@
  |****      THIS FILE IS GENERATED BY THE COMMONS BUILD PLUGIN      ****|
  |****                    DO NOT EDIT DIRECTLY                      ****|
  |****                                                              ****|
+ |**** Note: This file has been manually edited to fix the badges   ****|
+ |**** for Coverage and Maven Central. Please verify if updated.    ****|
+ |****                                                              ****|
  +======================================================================+
  | TEMPLATE FILE: readme-md-template.md                                 |
  | commons-build-plugin/trunk/src/main/resources/commons-xdoc-templates |
@@ -45,7 +48,7 @@ Apache Commons Codec
 
 [![Build Status](https://travis-ci.org/apache/commons-codec.svg)](https://travis-ci.org/apache/commons-codec)
 [![Coverage Status](https://coveralls.io/repos/apache/commons-codec/badge.svg?branch=master)](https://coveralls.io/github/apache/commons-codec?branch=master)
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/commons-codec/commons-codec/badge.svg)](https://maven-badges.herokuapp.com/maven-central/commons-codec/commons-codec/)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/commons-codec/commons-codec/badge.svg?gav=true)](https://search.maven.org/artifact/commons-codec/commons-codec/1.14/jar)
 [![Javadocs](https://javadoc.io/badge/commons-codec/commons-codec/1.14.svg)](https://javadoc.io/doc/commons-codec/commons-codec/1.14)
 
 The Apache Commons Codec package contains simple encoder and decoders for