bump 1.13.0-rc4

Signed-off-by: Victor Vieux <vieux@docker.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a45db7e..c90f53e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -198,6 +198,8 @@
 - Don't repull image if pinned by digest [#28265](https://github.com/docker/docker/pull/28265)
 + Swarm-mode support for Windows [#27838](https://github.com/docker/docker/pull/27838)
 + Allow hostname to be updated on service [#28771](https://github.com/docker/docker/pull/28771)
++ Support v2 plugins [#29433](https://github.com/docker/docker/pull/29433)
++ Add content trust for services [#29469](https://github.com/docker/docker/pull/29469)
 
 ### Volume
 
diff --git a/VERSION b/VERSION
index 5c71d9d..98348e8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.13.0-rc3
+1.13.0-rc4