Fix calculation of dex header signature

Patch by: Kevin Sun snxngxng@gmail.com

Bug: 135168811
Change-Id: I98290958cce65a0c88958b4f60c2e007af8ddc62
diff --git a/AUTHORS b/AUTHORS
index 9087735..02ac16e 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -5,4 +5,6 @@
 
 Google Inc.
 Uber Technologies Inc.
+
 Albert Jin <albert.jin@gmail.com>
+Kevin Sun <snxngxng@gmail.com>