Merge pull request TooTallNate#738 from marci4/master

Adjust readme

Author: marci4

README.markdown

@@ -1,8 +1,9 @@
 Java WebSockets
 ===============
 [![Build Status](https://travis-ci.org/marci4/Java-WebSocket-Dev.svg?branch=master)](https://travis-ci.org/marci4/Java-WebSocket-Dev)
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.java-websocket/Java-WebSocket/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.java-websocket/Java-WebSocket)
 [![Javadocs](https://www.javadoc.io/badge/org.java-websocket/Java-WebSocket.svg)](https://www.javadoc.io/doc/org.java-websocket/Java-WebSocket)
+[![Maven Central](https://img.shields.io/maven-central/v/org.java-websocket/Java-WebSocket.svg)](https://mvnrepository.com/artifact/org.java-websocket/Java-WebSocket)
+[![Sonatype Nexus (Snapshots)](https://img.shields.io/nexus/s/https/oss.sonatype.org/org.java-websocket/Java-WebSocket.svg)](https://oss.sonatype.org/content/repositories/snapshots/org/java-websocket/Java-WebSocket/)
 
 This repository contains a barebones WebSocket server and client implementation
 written in 100% Java. The underlying classes are implemented `java.nio`, which allows for a