bump development libgen version to new SNAPSHOT

Change-Id: I8acfcd9cd8d1c9dce1be032a0eaaedb029298125
diff --git a/tools/build/libgen/pom.xml b/tools/build/libgen/pom.xml
index 2f17fa1..d758361 100644
--- a/tools/build/libgen/pom.xml
+++ b/tools/build/libgen/pom.xml
@@ -29,7 +29,7 @@
     <groupId>org.onosproject</groupId>
     <artifactId>onos-libgen</artifactId>
     <packaging>jar</packaging>
-    <version>2.2</version>
+    <version>2.3-SNAPSHOT</version>
 
     <description>Third-party library generator for ONOS Bazel workspace</description>
     <url>http://onosproject.org/</url>