delete unneeded module

examples/signaling-server-nodejs/package.json

@@ -2,7 +2,7 @@
   "name": "libdatachannel-signaling-server",
   "version": "0.1.0",
   "description": "Signaling server example for libdatachannel",
-  "main": "server.js",
+  "main": "signaling-server.js",
   "scripts": {
     "start": "node signaling-server.js",
     "test": "echo \"Error: no test specified\" && exit 1"

examples/signaling-server-nodejs/signaling-server.js

@@ -17,7 +17,6 @@
  * along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
-const fs = require('fs');
 const http = require('http');
 const websocket = require('websocket');