Remove redundant comma.

test/web/twitter_api/views/activity_view_test.exs

@@ -80,7 +80,7 @@ test "a create activity with a note" do
       "text" => "Hey @shp!",
       "uri" => activity.data["object"]["id"],
       "user" => UserView.render("show.json", %{user: user}),
-      "visibility" => "direct",
+      "visibility" => "direct"
     }
 
     assert result == expected