README.md in ob64-0.3.0 vs README.md in ob64-0.4.0

- old
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 # Ob64 gem
 
 [![Gem Version](https://badge.fury.io/rb/ob64.svg)](http://rubygems.org/gems/ob64)
 [![Build Status](https://github.com/jcmfernandes/ob64/workflows/Test/badge.svg?branch=master&event=push)](https://github.com/jcmfernandes/ob64/actions?query=workflow:Test)
-[![Yard Docs](https://img.shields.io/badge/yard-docs-blue.svg)](http://www.rubydoc.info/gems/ob64/0.2.0)
+[![Yard Docs](https://img.shields.io/badge/yard-docs-blue.svg)](http://www.rubydoc.info/gems/ob64/0.4.0)
 
 A *fast* Base64 encoder and decoder as a Ruby gem.
 
 How fast? Try it yourself, execute:
 