prepare release beyonder-5.1

Author: dadoonet

pom.xml

@@ -5,7 +5,7 @@
     <groupId>fr.pilato.elasticsearch</groupId>
     <artifactId>elasticsearch-beyonder</artifactId>
     <packaging>jar</packaging>
-    <version>5.1-SNAPSHOT</version>
+    <version>5.1</version>
     <name>Elasticsearch Beyonder</name>
     <url>https://github.com/dadoonet/elasticsearch-beyonder</url>
     <description>