https://git.ruby-lang.org/ruby.git/commit/?id=ef795f9abd

From ef795f9abdb1db1bfa061dbc97d294db4f87756f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 29 Sep 2019 18:13:41 +0900
Subject: [ruby/stringio] Dropped older ruby versions

https://github.com/ruby/stringio/commit/e8065153b8

diff --git a/ext/stringio/stringio.gemspec b/ext/stringio/stringio.gemspec
index 96beb36..e49ab70 100644
--- a/ext/stringio/stringio.gemspec
+++ b/ext/stringio/stringio.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s| https://github.com/ruby/ruby/blob/trunk/ext/stringio/stringio.gemspec#L23
   s.files = ["README.md", "ext/stringio/extconf.rb", "ext/stringio/stringio.c"]
   s.homepage = "https://github.com/ruby/stringio"
   s.licenses = ["BSD-2-Clause"]
-  s.required_ruby_version = Gem::Requirement.new(">= 2.2")
+  s.required_ruby_version = ">= 2.4"
   s.rubygems_version = "2.6.11"
   s.summary = "Pseudo IO on String"
 
-- 
cgit v0.10.2


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