Update GWT version in GWT plugin archetype

Change-Id: I34a2478bbb2bc1712d9cc7f3370db55735829d51
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml b/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
index f619f91..3fa83f4 100644
--- a/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
+++ b/gerrit-plugin-gwt-archetype/src/main/resources/META-INF/maven/archetype-metadata.xml
@@ -25,7 +25,7 @@
       <defaultValue>http://code.google.com/p/gerrit/</defaultValue>
     </requiredProperty>
     <requiredProperty key="Gwt-Version">
-      <defaultValue>2.5.1</defaultValue>
+      <defaultValue>2.6.0</defaultValue>
     </requiredProperty>
 
     <requiredProperty key="gerritApiVersion">