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fix: ensure ruby 2.7 compatibility by including scanf gem

2

fix for #7 * scanf was excluded from the standard libary as of ruby 2.7 * see https://rubyreferences.github.io/rubychanges/2.7.html#libraries-excluded-from-the-standard-library * include the official scanf gem in gemspec

hendrixfan

Hi there, I'm using your libary to create [triangle patterns](https://github.com/hendrixfan/triangle) and I've noticed that there seems to be an Issue with Ruby 2.7. When I run `bin/console` in ruby 2.7...

hendrixfan