Add events to features

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/web/mastodon_api/views/instance_view.ex

@@ -173,7 +173,8 @@ def features do
       "pleroma:get:main/ostatus",
       if Pleroma.Language.Translation.configured?() do
         "translation"
-      end
+      end,
+      "events"
     ]
     |> Enum.filter(& &1)
   end