Cron implemented

package.json

@@ -21,6 +21,7 @@
   "dependencies": {
     "chalk": "^2.3.0",
     "command-line-args": "^4.0.7",
+    "cron": "^1.3.0",
     "moment": "^2.20.1",
     "mqtt": "^2.15.0",
     "nodemailer": "^4.4.1",
@@ -29,6 +30,7 @@
   "devDependencies": {
     "@types/chalk": "^2.2.0",
     "@types/command-line-args": "^4.0.2",
+    "@types/cron": "^1.2.1",
     "@types/moment": "^2.13.0",
     "@types/mqtt": "^2.5.0",
     "@types/node": "^8.5.8",