JAVA: Update version in pom.xml

java/pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.googlecode.libphonenumber</groupId>
   <artifactId>libphonenumber</artifactId>
-  <version>3.1-SNAPSHOT</version>
+  <version>3.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>libphonenumber</name>
   <url>http://code.google.com/p/libphonenumber/</url>