io-console.gemspec: update

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66580 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/io/console/io-console.gemspec

@@ -11,13 +11,20 @@ Gem::Specification.new do |s|
   s.description = "add console capabilities to IO instances."
   s.required_ruby_version = ">= 2.2.0"
   s.homepage = "https://github.com/ruby/io-console"
+  s.metadata["source_code_url"] = s.homepage
   s.authors = ["Nobu Nakada"]
   s.require_path = %[lib]
-  s.files = %w[ext/io/console/console.c ext/io/console/extconf.rb lib/console/size.rb ext/io/console/win32_vk.inc]
+  s.files = %w[
+    LICENSE.txt
+    README.md
+    ext/io/console/console.c
+    ext/io/console/extconf.rb
+    ext/io/console/win32_vk.inc
+    lib/io/console.rb
+    lib/io/console/size.rb
+  ]
   s.extensions = %w[ext/io/console/extconf.rb]
   s.license = "BSD-2-Clause"
-  s.cert_chain  = %w[certs/nobu.pem]
-  s.signing_key = File.expand_path("~/.ssh/gem-private_key.pem") if $0 =~ /gem\z/
 
   s.add_development_dependency 'rake-compiler'
   s.add_development_dependency 'rake-compiler-dock', ">= 0.6.1"