Add note about unsupported Ruby versions

guard · Apr 25, 2016 · 95df8b7 · 95df8b7
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+## IMPORTANT: [Ruby 2.1 is officially outdated and unsupported!](https://www.ruby-lang.org/en/news/2016/03/30/ruby-2-1-9-released/) Please upgrade to Ruby 2.2 before installing Listen!
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 :exclamation: Listen is currently accepting more maintainers. Please [read this](https://github.com/guard/guard/wiki/Maintainers) if you're interested in joining the team.
 
 # Listen