pushing fix per commit found here: https://github.com/cbou/mongoose-auth...

.../commit/edc2bd2a59b6d392e86b18dddd197d93e7538a26

There was a fix suggested here  that I implemented: https://github.com/cbou/mongoose-auth/commit/edc2bd2a59b6d392e86b18dddd197d93e7538a26

Can we commit this to master?