Add YouTube 16.20

Change-Id: Ic8fc3fd425b5cca464e212e3e508a148a95bee85
diff --git a/build.gradle b/build.gradle
index 3101886..cc51ea6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -437,7 +437,8 @@
         "protobuf-lite",
         "retrace_internal",
         "youtube/youtube.android_15.33",
-        "youtube/youtube.android_16.12"
+        "youtube/youtube.android_16.12",
+        "youtube/youtube.android_16.20"
     ],
 ]