Fix objc sample

samples/osx/configcatsample-objc/main.m

@@ -13,7 +13,7 @@ int main(int argc, const char * argv[]) {
                                                                  baseUrl:@""];
 
         // Creating a user object to identify your user (optional).
-        CCUser* userObject = [[CCUser alloc]initWithIdentifier:@"Some UserID"
+        ConfigCatUser* userObject = [[ConfigCatUser alloc]initWithIdentifier:@"Some UserID"
                                                      email:@"[email protected]"
                                                    country:@"CountryID"
                                                     custom:@{@"version": @"1.0.0"}];