Upgrade Rust SDK to spec 1.18.1

src/models/user_exists.rs

@@ -15,13 +15,17 @@ pub struct UserExists {
     /// Status if a user exist with that username or userId.
     #[serde(rename = "userExists")]
     pub user_exists: bool,
+    /// Is the username valid?
+    #[serde(rename = "nameOk")]
+    pub name_ok: bool,
 }
 
 impl UserExists {
     /// Status object representing if a queried user by username or userId exists or not. This model is primarily used by the `/auth/exists` endpoint, which in turn is used during registration. Please see the documentation on that endpoint for more information on usage.
-    pub fn new(user_exists: bool) -> UserExists {
+    pub fn new(user_exists: bool, name_ok: bool) -> UserExists {
         UserExists {
             user_exists,
+            name_ok,
         }
     }
 }