Bump package number for new cloud key

Change-Id: Id8f246764c500187d32a064fa60a13cc8225e028
diff --git a/debian/changelog b/debian/changelog
index 4fc9218..8573e24 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+mendel-keyring (3-3) UNRELEASED; urgency=medium
+
+  * Include the new Cloud Apt signing key.
+
+ -- Coral <coral-support@google.com>  Tue, 18 May 2021 09:17:22 -0700
+
 mendel-keyring (3-2) UNRELEASED; urgency=medium
 
   * Include the new GKE/Jenkins signing key.