Commits on Mar 30, 2021

1. Bump required ruby version to v2.4.0 …

   a9137ac introduced a use of Hash#transform_values in
   Listen::Record#dir_entries, however that was only added to Ruby in
   [v2.4](https://github.com/ruby/ruby/blob/v2_4_0/NEWS#core-classes-updates-outstanding-ones-only-).
   
   This can lead to runtime errors when run on an older version of Ruby,
   such as 2.2.7, which the gemspec previously implied was supported.
   
   Also expand CI to match and test on Ruby v2.4.

   

   cgunther committed Mar 30, 2021
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   25a099b View commit details

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