remove socket.io from dependencies

package.json

@@ -2,6 +2,7 @@
   "name": "hello_slackbot",
   "version": "0.0.1",
   "description": "hello slackbot",
+  "private": true,
   "main": "app.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
@@ -10,9 +11,8 @@
   "license": "MIT",
   "dependencies": {
     "body-parser": "^1.16.1",
+    "dotenv": "^4.0.0",
     "express": "^4.14.1",
-    "requestify": "^0.2.5",
-    "socket.io": "^1.7.3",
-    "dotenv": "^4.0.0"
+    "requestify": "^0.2.5"
   }
 }