[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/branches/NET_2_0@922962 13f79535-47bb-0310-9956-ffa450edef68

Author: Rory Winston

pom.xml

@@ -25,7 +25,7 @@ limitations under the License.
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>commons-net</groupId>
 	<artifactId>commons-net</artifactId>
-	<version>2.1</version>
+	<version>2.2-SNAPSHOT</version>
 	<name>Commons Net</name>
 	<description>
 		A collection of network utilities and protocol implementations.