Increment Version to 2.2_r6

Change-Id: I3a344fe0aa70d39b9ba2d13e4b81e21a89e50df4
diff --git a/tools/host/src/com/android/cts/Version.java b/tools/host/src/com/android/cts/Version.java
index 4fd2529..5410ed3 100644
--- a/tools/host/src/com/android/cts/Version.java
+++ b/tools/host/src/com/android/cts/Version.java
@@ -18,7 +18,7 @@
 
 public class Version {
     // The CTS version string
-    private static final String version = "2.2_r5";
+    private static final String version = "2.2_r6";
 
     private Version() {
         // no instances allowed