Update README.md

Author: bbottema

README.md

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-[![APACHE v2 License](https://img.shields.io/badge/license-apachev2-blue.svg?style=flat)](LICENSE-2.0.txt) [![Latest Release](https://img.shields.io/maven-central/v/org.simplejavamail/simple-java-mail.svg?style=flat)](http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.simplejavamail%22%20AND%20a%3A%22simple-java-mail%22) [![Javadocs](http://www.javadoc.io/badge/org.simplejavamail/simple-java-mail.svg?color=brightgreen)](http://www.javadoc.io/doc/org.simplejavamail/simple-java-mail) [![Build Status](https://img.shields.io/travis/bbottema/simple-java-mail.svg?style=flat)](https://travis-ci.org/bbottema/simple-java-mail) [![Codacy](https://img.shields.io/codacy/9f142ca8c8c640c984835a8ae02d29f3.svg?style=flat)](https://www.codacy.com/app/b-bottema/simple-java-mail)
+[![APACHE v2 License](https://img.shields.io/badge/license-apachev2-blue.svg?style=flat)](LICENSE-2.0.txt) [![Latest Release](https://img.shields.io/maven-central/v/org.simplejavamail/simple-java-mail.svg?style=flat)](http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.simplejavamail%22%20AND%20a%3A%22simple-java-mail%22) [![Sonatype Nexus (Snapshots)](https://img.shields.io/nexus/s/https/oss.sonatype.org/org.simplejavamail/simple-java-mail.svg)](https://stackoverflow.com/questions/7715321/how-to-download-snapshot-version-from-maven-snapshot-repository/7717234#7717234)[![Javadocs](http://www.javadoc.io/badge/org.simplejavamail/simple-java-mail.svg?color=brightgreen)](http://www.javadoc.io/doc/org.simplejavamail/simple-java-mail) [![Build Status](https://img.shields.io/travis/bbottema/simple-java-mail.svg?style=flat)](https://travis-ci.org/bbottema/simple-java-mail) [![Codacy](https://img.shields.io/codacy/9f142ca8c8c640c984835a8ae02d29f3.svg?style=flat)](https://www.codacy.com/app/b-bottema/simple-java-mail)
 
 # Simple Java Mail #