Notify bugsnag on 404 errors

app/controllers/errors_controller.rb

@@ -4,6 +4,11 @@ class ErrorsController < ApplicationController
   layout "errors"
 
   def not_found
+    Bugsnag.notify("404") do |event|
+      event.severity = "info"
+
+      event.add_metadata(:request, request.env)
+    end
     render status: :not_found
   end