package.json : drop mongo dependency, bump ws dependency up to a modern version

package.json

@@ -1,10 +1,9 @@
 {
-    "name": "cryptpad",
+  "name": "cryptpad",
-    "description": "realtime collaborative visual editor with zero knowlege server",
+  "description": "realtime collaborative visual editor with zero knowlege server",
-    "version": "0.1.0",
+  "version": "0.1.0",
-    "dependencies": {
+  "dependencies": {
-        "express": "~4.10.1",
+    "express": "~4.10.1",
-        "ws": "~0.4.32",
+    "ws": "~0.8.0"
-        "mongodb": "~2.0.5"
+  }
-    }
 }