Set the version of the dependency on assembly-configuration to 2.1

Author: mmoqui

pom.xml

@@ -1936,7 +1936,7 @@
     <jackrabbit.version>2.5.1</jackrabbit.version>
     <mockrunner.version>0.4.2</mockrunner.version>
     <wagon.version>2.0</wagon.version>
-    <config.version>2.1-SNAPSHOT</config.version>
+    <config.version>2.1</config.version>
     <slf4j.version>1.5.6</slf4j.version>
     <lucene.version>3.6.1</lucene.version>
     <poi.version>3.8</poi.version>