README.md in acb-0.1.4 vs README.md in acb-0.1.5

@@ -58,10 +58,10 @@
   def relations
     [:user, :comments]
   end
 end
 
-PostCsvBuilder.new(user_id).content_string
+PostCsvBuilder.new(user_id).to_csv
 ```
 
 ## Code of Conduct
 
 Everyone interacting in the Acb project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/kakubin/acb/blob/main/CODE_OF_CONDUCT.md).