Promote English to the default gems.

lib/English.gemspec

@@ -0,0 +1,23 @@
+Gem::Specification.new do |spec|
+  spec.name          = "English"
+  spec.version       = "0.1.0"
+  spec.authors       = ["Yukihiro Matsumoto"]
+  spec.email         = ["matz@ruby-lang.org"]
+
+  spec.summary       = %q{Require 'English.rb' to reference global variables with less cryptic names.}
+  spec.description   = %q{Require 'English.rb' to reference global variables with less cryptic names.}
+  spec.homepage      = "https://github.com/ruby/English"
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
+  spec.bindir        = "exe"
+  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+end

tool/sync_default_gems.rb

@@ -58,6 +58,7 @@
 # * https://github.com/ruby/weakref
 # * https://github.com/ruby/tempfile
 # * https://github.com/ruby/tmpdir
+# * https://github.com/ruby/English
 #
 
 require 'fileutils'
@@ -114,6 +115,7 @@ $repositories = {
   weakref: "ruby/weakref",
   tempfile: "ruby/tempfile",
   tmpdir: "ruby/tmpdir",
+  English: "ruby/English",
 }
 
 def sync_default_gems(gem)