Remove sleep dependency

package.json

@@ -10,8 +10,7 @@
     "memory-cache": "latest",
     "node-file-cache": "^1.0.2",
     "openpgp": "latest",
-    "sleep": "^5.2.3",
-    "sqlite3": "^4.0.0",
+    "sqlite3": "^4.1.1",
     "ws": "latest"
   },
   "repository": {

srv/src/slack.js

@@ -1,8 +1,7 @@
 
 const
     WebSocket = require('ws'),
-    https = require('https'),
-    sleep = require("sleep").sleep
+    https = require('https')
 
     ,SlackData = require("./slackData.js").SlackData
     ,SlackHistory = require("./slackHistory.js").SlackHistory