connection_pool.gemspec in connection_pool-2.2.3 vs connection_pool.gemspec in connection_pool-2.2.4

@@ -15,6 +15,7 @@
   s.require_paths = ["lib"]
   s.license = "MIT"
   s.add_development_dependency "bundler"
   s.add_development_dependency "minitest", ">= 5.0.0"
   s.add_development_dependency "rake"
+  s.required_ruby_version = ">= 2.2.0"
 end