Gemfile in caretaker-0.7.0 vs Gemfile in caretaker-0.8.0

@@ -1,5 +1,6 @@
 source 'https://rubygems.org'
+ruby '>= 2.5.0'
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Specify your gem's dependencies in slackit.gemspec
 gemspec