update README

Author: hidakatsuya

Diff for: README.md

@@ -10,7 +10,7 @@ A simple task management application using Thinreports and Rails.
 
 - Ruby 2.7, 3.0, 3.1, 3.2
 - Rails 7.0
-- [thinreports-generator](https://github.com/thinreports/thinreports-generator) 0.12.0
+- [thinreports-generator](https://github.com/thinreports/thinreports-generator) 0.13.0
 - [thinreports-rails](https://github.com/takeshinoda/thinreports-rails) 0.5.0
 
 An sample application with Rails 6.1 can be found in [the rails-6 branch](https://github.com/thinreports/thinreports-rails-example/tree/rails-6).