README.md in tanshuku-1.0.1 vs README.md in tanshuku-2.0.0

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-[![RubyGems.org](https://img.shields.io/badge/RubyGems.org-Tanshuku%20v1-red)](https://rubygems.org/gems/tanshuku/versions/1.0.0)
-[![Ruby 2.5+](https://img.shields.io/badge/Ruby-2.5+-red)](https://www.ruby-lang.org)
-[![Rails 5.1+](https://img.shields.io/badge/Rails-5.1+-red)](https://rubyonrails.org/)
-[![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
-[![Checks](https://github.com/kg8m/tanshuku/actions/workflows/checks.yml/badge.svg?branch=1-0-stable)](https://github.com/kg8m/tanshuku/blob/1-0-stable/.github/workflows/checks.yml)
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 # Tanshuku
 
 Tanshuku is a simple and small Rails engine that makes it easier to shorten URLs.
 
 ## Key Features