Add 3.0 to rewrites

Change-Id: Iff5af519d3eb0bda79b3a423b1c034d56f71e172
diff --git a/firebase.json b/firebase.json
index b3b7327..6923b43 100644
--- a/firebase.json
+++ b/firebase.json
@@ -93,6 +93,11 @@
         "type": 301
       },
       {
+        "source": "/releases/3.0.md",
+        "destination": "/3.0.html",
+        "type": 301
+      },
+      {
         "source": "/releases/public-keys.md",
         "destination": "/public-keys.html",
         "type": 301