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

jetty-osgi-servlet-api/pom.xml

diff --git a/jetty-osgi-servlet-api/pom.xml b/jetty-osgi-servlet-api/pom.xml
index 6478b67..a7a7530 100644
--- a/jetty-osgi-servlet-api/pom.xml
+++ b/jetty-osgi-servlet-api/pom.xml
@@ -8,7 +8,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.eclipse.jetty.toolchain</groupId>
   <artifactId>jetty-osgi-servlet-api</artifactId>
-  <version>3.1.0.M0</version>
+  <version>3.1-SNAPSHOT</version>
   <name>Jetty :: Servlet API and Schemas for OSGi </name>
   <packaging>jar</packaging>
   <properties>