docs: add javadoc badge to the project readme

http://javadoc.io/doc/org.postgresql/postgresql provides up to date javadoc viewer
pgjdbc · Aug 9, 2016 · 5d7a9bb · 5d7a9bb
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diff --git a/README.md b/README.md
@@ -3,6 +3,7 @@
 
 [![Build Status](https://travis-ci.org/pgjdbc/pgjdbc.svg?branch=master)](https://travis-ci.org/pgjdbc/pgjdbc)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.postgresql/postgresql/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.postgresql/postgresql)
+[![Javadocs](http://javadoc.io/badge/org.postgresql/postgresql.svg)](http://javadoc.io/doc/org.postgresql/postgresql)
 [![Join the chat at https://gitter.im/pgjdbc/pgjdbc](https://badges.gitter.im/pgjdbc/pgjdbc.svg)](https://gitter.im/pgjdbc/pgjdbc?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 This is a simple readme describing how to compile and use the PostgreSQL JDBC driver.