Twelve: Optimize and shrink resources

Usually a safe set of optimizations

Change-Id: I1074af3a758439ff82771b03bdb0c4484828ca25
diff --git a/app/Android.bp b/app/Android.bp
index f34c993..1aa28fb 100644
--- a/app/Android.bp
+++ b/app/Android.bp
@@ -72,7 +72,9 @@
     ],
 
     optimize: {
+        optimize: true,
         proguard_flags_files: ["proguard-rules.pro"],
+        shrink_resources: true,
     },
 }