Add support for editing slash commands (#4335)

webapp/routes/route_integrations.jsx

@@ -65,6 +65,12 @@ export default {
                         System.import('components/integrations/components/add_command.jsx').then(RouteUtils.importComponentSuccess(callback));
                     }
                 },
+                {
+                    path: 'edit',
+                    getComponents: (location, callback) => {
+                        System.import('components/integrations/components/edit_command.jsx').then(RouteUtils.importComponentSuccess(callback));
+                    }
+                },
                 {
                     path: 'confirm',
                     getComponents: (location, callback) => {