Bump dx version to 1.11

This version includes "Support --num-threads with --multi-dex"

(cherry picked from commit 7d97556f4b60fd9cf88db6d477500a69a6e853ea)

Change-Id: I712145094205d56358ef0b9ff51f137907d972e9
diff --git a/dx/src/com/android/dx/Version.java b/dx/src/com/android/dx/Version.java
index 5f02e47..1e15d55 100644
--- a/dx/src/com/android/dx/Version.java
+++ b/dx/src/com/android/dx/Version.java
@@ -21,5 +21,5 @@
  */
 public class Version {
     /** {@code non-null;} version string */
-    public static final String VERSION = "1.10";
+    public static final String VERSION = "1.11";
 }