CI against Ruby 3.0.2, 2.7.4 and 2.6.8 #197
                
     Merged
            
            
          
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Ruby 3.0.2 Released
https://www.ruby-lang.org/en/news/2021/07/07/ruby-3-0-2-released/
Ruby 2.7.4 Released
https://www.ruby-lang.org/en/news/2021/07/07/ruby-2-7-4-released/
Ruby 2.6.8 Released
https://www.ruby-lang.org/en/news/2021/07/07/ruby-2-6-8-released/