message: Fix Redux Form example in Library Code Comparison
  * Fix username validation checking string length
  * Fix username validation allowing admin user
  The username check was doing the opposite of its intended goal - rather than giving an error for usernames of 'admin', it gave an error for all usernames except 'admin'
diff: @@ -8,7 +8,7 @@ const validate = values => {
  if (!values.username) {
  errors.username = "Required";
  - } else if (values.username.length !== "admin") {
  + } else if (values.username === "admin") {
  errors.username = "Nice try!";
  }
  