Updated 1.0 CHANGELOG about MESOS-5834.

Review: https://reviews.apache.org/r/50368
diff --git a/CHANGELOG b/CHANGELOG
index 2e1b363..54b5f31 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -433,6 +433,7 @@
     * [MESOS-5794] - Agent's /containers endpoint should skip terminated executors.
     * [MESOS-5799] - docker::inspect() may get wrong output when a docker container is not in "running" state
     * [MESOS-5806] - CNI isolator should prepare network related /etc/* files for containers using host mode but specify container images.
+    * [MESOS-5834] - Mesos may pass --volume-driver to the Docker daemon multiple times.
     * [MESOS-5844] - PersistentVolumeEndpointsTest.OfferCreateThenEndpointRemove test is flaky
     * [MESOS-5845] - The fetcher can access any local file as root
     * [MESOS-5848] - Docker health checks are malformed.