fix lint err

src/server/routes/page.js

@@ -142,7 +142,7 @@ module.exports = function(crowi, app) {
   const ApiResponse = require('../util/apiResponse');
   const getToday = require('../util/getToday');
 
-  const { slackNotificationService, configManager, xssService } = crowi;
+  const { configManager, xssService } = crowi;
   const interceptorManager = crowi.getInterceptorManager();
   const globalNotificationService = crowi.getGlobalNotificationService();
   const userNotificationService = crowi.getUserNotificationService();