Update 2.13 release notes

Change-Id: If0fc78bda1175bd8c83b1aefd469213369c88cc4
diff --git a/ReleaseNotes/ReleaseNotes-2.13.txt b/ReleaseNotes/ReleaseNotes-2.13.txt
index d73a1bd..000b2db 100644
--- a/ReleaseNotes/ReleaseNotes-2.13.txt
+++ b/ReleaseNotes/ReleaseNotes-2.13.txt
@@ -327,6 +327,18 @@
 capability, or to ensure that specific groups always have administration
 capabilities.
 
+* New configuration options to configure JGit repository cache parameters.
++
+link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.13/config-gerrit.html#core.repositoryCacheCleanupDelay[
+core.repositoryCacheCleanupDelay] and
+link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.13/config-gerrit.html#core.repositoryCacheExpireAfter[
+core.repositoryCacheExpireAfter] can be configured.
+
+* Accept `-b` as an alias of `--batch` in the
+link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.13/pgm-init.html[
+init program].
+
+
 == Bug Fixes
 
 * Don't add the same SSH key multiple times.
@@ -400,6 +412,22 @@
 easier to track down which commit failed validation when multiple commits
 are pushed at the same time.
 
+* Don't check mergeability of draft changes.
++
+Draft changes can be deleted but not abandoned so there is no way for
+an administrator to get rid of the them on behalf of the users. This can
+become a problem when there many draft changes because the mergeability
+check can be costly.
++
+The mergeability check is no longer done for draft changes, but will be
+done when the draft change is published.
+
+* Fix internal server error when plugin-provided file history weblink
+is null.
++
+It is valid for a plugin to provide a null weblink, but doing so resulted
+in an internal server error.
+
 == Dependency updates
 
 * Add dependency on blame-cache 0.1-9