update salt generation

src/libs/models/user.js

@@ -16,7 +16,7 @@ var UserSchema = new Schema({
 UserSchema.pre('save', function(next){
   var user = this;
   if(this.isModified('password') || this.isNew){
-    bcrypt.genSalt(10, function (err, salt){
+    bcrypt.genSalt(128, function (err, salt){
       if(err){
         return next(err);
       }