imap-backup.gemspec in imap-backup-6.0.0.rc2 vs imap-backup.gemspec in imap-backup-6.0.0

@@ -16,11 +16,10 @@
   gem.files         += Dir.glob("lib/**/*.rb")
   gem.files         += %w[imap-backup.gemspec]
   gem.files         += %w[LICENSE README.md]
 
   gem.executables   = gem.files.grep(%r{^bin/}).map { |f| File.basename(f) }
-  gem.test_files    = Dir.glob("spec/**/*{.rb,.yml}")
   gem.require_paths = ["lib"]
   gem.required_ruby_version = ">= 2.5"
 
   gem.add_runtime_dependency "highline"
   gem.add_runtime_dependency "mail"
@@ -32,6 +31,11 @@
   gem.add_development_dependency "aruba", ">= 0.0.0"
   gem.add_development_dependency "pry-byebug"
   gem.add_development_dependency "rspec", ">= 3.0.0"
   gem.add_development_dependency "rubocop-rspec"
   gem.add_development_dependency "simplecov"
+  gem.add_development_dependency "yard"
+
+  gem.metadata = {
+    "rubygems_mfa_required" => "true"
+  }
 end