Fixed link

Author: derjust

README.md

@@ -1,5 +1,5 @@
 [![codecov.io](https://codecov.io/github/derjust/spring-data-dynamodb/coverage.svg?branch=master)](https://codecov.io/github/derjust/spring-data-dynamodb?branch=master) [![Build Status](https://travis-ci.org/derjust/spring-data-dynamodb.svg?branch=master)](https://travis-ci.org/derjust/spring-data-dynamodb) 
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+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.derjust/spring-data-dynamodb/badge.svg)](https://search.maven.org/search?q=g:com.github.derjust)
 [![Developer Workspace](https://codenvy.io/factory/resources/codenvy-contribute.svg)](https://codenvy.io/f?user=userrzonfqnofgrmfxjx&name=spring-data-dynamodb)
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