clean code

lib/util/slack.js

@@ -15,7 +15,7 @@ module.exports = function(crowi) {
   slack.appController = undefined;  // for Slack App
   slack.iwhController = undefined;  // for Slack Incoming Webhooks
 
-  isDebugSlackbot = true;           // for debug
+  // isDebugSlackbot = true;           // for debug
 
   slack.getBot = function() {
     var config = crowi.getConfig();