Maven: prepare release 2.2.2

Author: luisgoncalves

pom.xml

@@ -4,7 +4,7 @@
     <groupId>com.googlecode.xades4j</groupId>
     <artifactId>xades4j</artifactId>
     <packaging>jar</packaging>
-    <version>2.2.2-SNAPSHOT</version>
+    <version>2.2.2</version>
     <name>xades4j</name>
     <url>https://github.com/luisgoncalves/xades4j</url>