Update windows slave installer module from 1.5.1 to 1.6 (#2386)

See https://github.com/jenkinsci/windows-slave-installer-module/pull/3

changelog.html

@@ -56,7 +56,9 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
-  <li class=>
+  <li class=bug>
+    Improved .NET compatibility with modern Windows build agent installation
+    (<a href="https://github.com/jenkinsci/windows-slave-installer-module/pull/3">PR #3</a>)
 </ul>
 </div><!--=TRUNK-END=-->
 <h3><a name=v2.7>What's new in 2.7</a> (2016/05/29)</h3>

war/pom.xml

@@ -114,7 +114,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>org.jenkins-ci.modules</groupId>
       <artifactId>windows-slave-installer</artifactId>
-      <version>1.5.1</version>
+      <version>1.6</version>
     </dependency>
     <dependency>
       <groupId>org.jenkins-ci.modules</groupId>