Fixes typo in error_handler

lib/error_handler.js

@@ -20,7 +20,7 @@ module.exports = function (err, req, res, next) {
     // if the error came from trying to create a user that already exists,
     // the error message will contain a bunch of data about that user.
     // That's a major vulnerability, so we need to send back a custom message
-    const message = 'The receieved params failed a Mongoose validation'
+    const message = 'The received params failed a Mongoose validation'
     err = { status: 422, message }
   } else if (err.name === 'DocumentNotFoundError') {
     err.status = 404