Merge pull request #78 from valery1707/badges

Add some useful badges with automatic version detection: Maven and Javadoc

Author: cowtowncoder

README.md

@@ -5,6 +5,8 @@ to support JSON serialization and deserialization of
 ## Status
 
 [![Build Status](https://travis-ci.org/FasterXML/jackson-datatype-joda.svg)](https://travis-ci.org/FasterXML/jackson-datatype-joda)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.jackson.datatype/jackson-datatype-joda/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.jackson.datatype/jackson-datatype-joda/)
+[![Javadoc](https://javadoc-emblem.rhcloud.com/doc/com.fasterxml.jackson.datatype/jackson-datatype-joda/badge.svg)](http://www.javadoc.io/doc/com.fasterxml.jackson.datatype/jackson-datatype-joda)
 
 Module has been production-ready since version 2.0, and offers relatively extensive support for Joda datatypes.
 Contributions are always welcome -- not all types are yet supported; and we may want to support even wider alternative