Set support at >= 2.2.10

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [1.9, '2.0', 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, jruby]
+        ruby: [2.2, 2.3, 2.4, 2.5, 2.6, 2.7, '3.0', 3.1, jruby]
 
     env:
       JAVA_OPTS: '-Xmx1024m'

README.md

@@ -259,7 +259,7 @@ be obeyed though. Features developed in `concurrent-ruby-edge` are expected to m
 
 ## Supported Ruby versions
 
-* MRI 2.4.10 and above
+* MRI 2.2.10 and above
 * Latest JRuby 9000
 * Latest TruffleRuby
 

concurrent-ruby-edge.gemspec

@@ -23,7 +23,7 @@ be obeyed though. Features developed in `concurrent-ruby-edge` are expected to m
 Please see http://concurrent-ruby.com for more information.
   TXT
 
-  s.required_ruby_version = '>= 1.9.3'
+  s.required_ruby_version = '>= 2.2.10'
 
   s.add_runtime_dependency 'concurrent-ruby', "~> #{Concurrent::VERSION}"
 end

concurrent-ruby-ext.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.require_paths    = ['lib']
   s.extensions       = 'ext/concurrent-ruby-ext/extconf.rb'
 
-  s.required_ruby_version = '>= 1.9.3'
+  s.required_ruby_version = '>= 2.2.10'
 
   s.add_runtime_dependency 'concurrent-ruby', "= #{Concurrent::VERSION}"
 end

concurrent-ruby.gemspec

@@ -27,5 +27,5 @@ Gem::Specification.new do |s|
   TXT
   s.metadata["source_code_uri"] = "https://github.com/ruby-concurrency/concurrent-ruby"
   s.metadata["changelog_uri"] = "https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md"
-  s.required_ruby_version = '>= 1.9.3'
+  s.required_ruby_version = '>= 2.2.10'
 end