Add 3.8 to releases-readme

Change-Id: I42e1c3fa7b751a22041d62f4cd97ac5747647216

pages/site/releases/README.md

diff --git a/pages/site/releases/README.md b/pages/site/releases/README.md
index 8f11456..3dd2300 100644
--- a/pages/site/releases/README.md
+++ b/pages/site/releases/README.md
@@ -18,6 +18,14 @@
 Latest release: **[3.7](/3.7.html)**. The support status of all recent Gerrit versions is
 [summarized here](https://www.gerritcodereview.com/support.html#supported-versions).
 
+## 3.8 (RC)
+
+* Rebase on behalf of the uploader
+
+* Rebase a chain of changes
+
+[Release notes for Gerrit 3.8](/3.8.html)
+
 ## 3.7
 
 * UI mostly migrated to [Lit](https://lit.dev/)