Add url to the pom as this seems to be a new demand by Sonatype

Author: zapodot

pom.xml

@@ -3,10 +3,11 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.zapodot</groupId>
     <artifactId>jackson-databind-java-optional</artifactId>
-    <version>2.5.2-SNAPSHOT</version>
+    <version>2.5.2</version>
     <packaging>bundle</packaging>
     <description>Jackson Databind module for serializing and deserializing Java 8 java.util.Option objects.
         This tool is forked from original source created by @realjenius </description>
+    <url>https://github.com/zapodot/jackson-databind-java-optional</url>
     <developers>
         <developer>
             <id>realjenius</id>