Update link to Gerrit v3.10.0 from the homepage

Change-Id: I929be43b42f866f051560db1dd06a7406cc5b1e1

index.md

diff --git a/index.md b/index.md
index f8ee5c1..91075ce 100644
--- a/index.md
+++ b/index.md
@@ -68,7 +68,7 @@
                 <div class="panel-body">
                     <h4>Download</h4>
                     <p>Our latest release is:<br>
-                    <b><a href="3.10.html">3.9.4</a></b>
+                    <b><a href="3.10.html">3.10.0</a></b>
                     </p>
                     <a href="https://gerrit-releases.storage.googleapis.com/gerrit-3.10.0.war" class="btn btn-primary">Download</a>
                 </div>