[maven-release-plugin] prepare release libvirt-slave-1.9.0

Author: Bastian Germann

pom.xml

@@ -9,7 +9,7 @@
     </parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>libvirt-slave</artifactId>
-    <version>1.9.0-SNAPSHOT</version>
+    <version>1.9.0</version>
     <packaging>hpi</packaging>
     <name>Jenkins Libvirt Agents plugin</name>
     <description>This plugin allows Jenkins to use libvirt-based agents.</description>
@@ -45,7 +45,7 @@
         <connection>scm:git:git://github.com/jenkinsci/libvirt-slave-plugin.git</connection>
         <developerConnection>scm:git:git@github.com:jenkinsci/libvirt-slave-plugin.git</developerConnection>
         <url>https://github.com/jenkinsci/libvirt-slave-plugin</url>
-        <tag>HEAD</tag>
+        <tag>libvirt-slave-1.9.0</tag>
     </scm>
     <properties>
         <java.level>8</java.level>