message: Make email optional
diff: @@ -26,7 +26,7 @@ pub struct PrivateUser {
  pub birthdate: Option<NaiveDate>,
  pub country: String,
  pub display_name: Option<String>,
  - pub email: String,
  + pub email: Option<String>,
  pub external_urls: HashMap<String, String>,
  pub followers: Option<HashMap<String, Option<Value>>>,
  pub href: String,
  