Update README.md

Author: mkalinin

README.md

@@ -1,6 +1,5 @@
 # Welcome to ethereumj
 
-[![Slack Status](http://harmony-slack-ether-camp.herokuapp.com/badge.svg)](http://ether.camp) 
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ethereum/ethereumj?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://travis-ci.org/ethereum/ethereumj.svg?branch=master)](https://travis-ci.org/ethereum/ethereumj)
 [![Coverage Status](https://coveralls.io/repos/ethereum/ethereumj/badge.png?branch=master)](https://coveralls.io/r/ethereum/ethereumj?branch=master)
@@ -19,7 +18,7 @@ We keep EthereumJ as thin as possible. For [JSON-RPC](https://github.com/ethereu
    <dependency>
      <groupId>org.ethereum</groupId>
      <artifactId>ethereumj-core</artifactId>
-     <version>1.6.3-RELEASE</version>
+     <version>1.8.0-RELEASE</version>
    </dependency>
 ```
 
@@ -31,7 +30,7 @@ We keep EthereumJ as thin as possible. For [JSON-RPC](https://github.com/ethereu
        jcenter()
        maven { url "https://dl.bintray.com/ethereum/maven/" }
    }
-   compile "org.ethereum:ethereumj-core:1.6.+"
+   compile "org.ethereum:ethereumj-core:1.8.+"
 ```
 
 As a starting point for your own project take a look at https://github.com/ether-camp/ethereumj.starter