added "apt.vm" to recognized extensions

git-svn-id: https://svn.apache.org/repos/asf/maven/sandbox/branches/doxia-ide-eclipse-with-tycho@1163121 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/eclipse-plugins/plugins/org.apache.maven.doxia.ide.eclipse.apt.ui/plugin.xml b/eclipse-plugins/plugins/org.apache.maven.doxia.ide.eclipse.apt.ui/plugin.xml
index 7ce546d..4fd958d 100644
--- a/eclipse-plugins/plugins/org.apache.maven.doxia.ide.eclipse.apt.ui/plugin.xml
+++ b/eclipse-plugins/plugins/org.apache.maven.doxia.ide.eclipse.apt.ui/plugin.xml
@@ -26,7 +26,7 @@
          point="org.eclipse.ui.editors">
       <editor
             name="%editor.name"
-            extensions="apt"
+            extensions="apt,apt.vm"
             icon="icons/doxia.gif"
             contributorClass="org.apache.maven.doxia.ide.eclipse.apt.ui.editor.AptEditorContributor"
             class="org.apache.maven.doxia.ide.eclipse.apt.ui.editor.AptEditor"