chore(doc): fix maven badge
# jetcd - A Java Client for etcd
[![Build Status](https://img.shields.io/travis/coreos/jetcd/master.svg?style=flat-square)](https://travis-ci.org/coreos/jetcd)
[![License](https://img.shields.io/badge/Licence-Apache%202.0-blue.svg?style=flat-square)](http://www.apache.org/licenses/LICENSE-2.0.html)
-[![Maven Central](https://img.shields.io/maven-central/v/com/coreos/jetcd-core.svg?style=flat-square)](https://search.maven.org/#search%7Cga%7C1%7Ccoreos)
+[![Maven Central](https://img.shields.io/maven-central/v/com.coreos/jetcd-core.svg?style=flat-square)](https://search.maven.org/#search%7Cga%7C1%7Ccoreos)
[![GitHub release](https://img.shields.io/github/release/coreos/jetcd.svg?style=flat-square)](https://github.com/coreos/jetcd/releases)
jetcd is the official java client for [etcd](https://github.com/coreos/etcd)v3.
