Restore 1.9.3 support

Author: Andrew

.ruby-version

@@ -0,0 +1 @@
+1.9.3

public_suffix.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.files = [".gemtest", ".gitignore", ".ruby-gemset", ".travis.yml", ".yardopts", "CHANGELOG.md", "Gemfile", "LICENSE.txt", "README.md", "Rakefile", "data/definitions.txt", "lib/public_suffix.rb", "lib/public_suffix/domain.rb", "lib/public_suffix/errors.rb", "lib/public_suffix/list.rb", "lib/public_suffix/rule.rb", "lib/public_suffix/version.rb", "public_suffix.gemspec", "test/acceptance_test.rb", "test/test_helper.rb", "test/unit/domain_test.rb", "test/unit/errors_test.rb", "test/unit/list_test.rb", "test/unit/public_suffix_test.rb", "test/unit/rule_test.rb"]
   s.homepage = "http://simonecarletti.com/code/publicsuffix"
   s.licenses = ["MIT"]
-  s.required_ruby_version = Gem::Requirement.new(">= 2.0")
+  s.required_ruby_version = Gem::Requirement.new(">= 1.9.3")
   s.rubygems_version = "2.4.5"
   s.summary = "Domain name parser based on the Public Suffix List."
   s.test_files = ["test/acceptance_test.rb", "test/test_helper.rb", "test/unit/domain_test.rb", "test/unit/errors_test.rb", "test/unit/list_test.rb", "test/unit/public_suffix_test.rb", "test/unit/rule_test.rb"]