[maven-release-plugin] prepare release v3.1

pom.xml

@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <name>NetBeans serial version uid generator</name>
@@ -17,7 +15,7 @@
 
     <groupId>eu.hlavki.netbeans</groupId>
     <artifactId>netbeans-svuid-generator</artifactId>
-    <version>3.1-SNAPSHOT</version>
+    <version>3.1</version>
     <packaging>nbm</packaging>
 
     <developers>
@@ -35,7 +33,8 @@
         <url>https://github.com/hlavki/netbeans-svuid-generator</url>
         <connection>scm:git:https://github.com:hlavki/netbeans-svuid-generator.git</connection>
         <developerConnection>scm:git:[email protected]:hlavki/netbeans-svuid-generator.git</developerConnection>
-    </scm>
+      <tag>v3.1</tag>
+  </scm>
 
     <issueManagement>
         <system>github</system>