Bump pp version to 0.2.1

lib/pp.gemspec

@@ -1,21 +1,24 @@
 Gem::Specification.new do |spec|
   spec.name          = "pp"
-  spec.version       = "0.1.0"
+  spec.version       = "0.2.1"
   spec.authors       = ["Tanaka Akira"]
   spec.email         = ["akr@fsij.org"]
 
   spec.summary       = %q{Provides a PrettyPrinter for Ruby objects}
   spec.description   = %q{Provides a PrettyPrinter for Ruby objects}
   spec.homepage      = "https://github.com/ruby/pp"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
   spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.7.0")
+
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
 
-  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.files         = %w[
+    LICENSE.txt
+    lib/pp.rb
+    pp.gemspec
+  ]
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]

lib/pp.rb

@@ -237,7 +237,7 @@ class PP < PrettyPrint
         else
           sep.call
         end
-        yield(*v, **{})
+        RUBY_VERSION >= "3.0" ? yield(*v, **{}) : yield(*v)
       }
     end