Added Maven badge to readme

README.md

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 # Bit Wrapper
 
-[![Build Status](https://travis-ci.org/bencampion/bit-wrapper.svg?branch=master)](https://travis-ci.org/bencampion/bit-wrapper) [![Coverage Status](http://coveralls.io/repos/bencampion/bit-wrapper/badge.svg?branch=master&service=github)](http://coveralls.io/github/bencampion/bit-wrapper?branch=master)
+[![Build Status](https://travis-ci.org/bencampion/bit-wrapper.svg?branch=master)](https://travis-ci.org/bencampion/bit-wrapper) [![Coverage Status](http://coveralls.io/repos/bencampion/bit-wrapper/badge.svg?branch=master&service=github)](http://coveralls.io/github/bencampion/bit-wrapper?branch=master) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/cz.jirutka.rsql/rsql-parser/badge.svg)](https://maven-badges.herokuapp.com/maven-central/uk.recurse.bitwrapper/bit-wrapper)
+
 
 Bit wrapper is an declarative framework written in Java for parsing binary data in a `byte[]` or `ByteBuffer`. It uses annotated interfaces to describe the fields in a bitstream and generates implementations of these interfaces at runtime that can be used to access the fields. Bit Wrapper is lazy; it doesn't copy data from the underlying `byte[]` or `ByteBuffer` until it needs to.
 
 * [API documentation](https://bencampion.github.io/bit-wrapper/apidocs/)
 
+Bit wrapper is inspired by (and very similar to) [Preon](https://github.com/preon/preon).
+
 ## Examples
 
 ### IPv6 packet header