Gemfile in google_web_translate-0.2.2 vs Gemfile in google_web_translate-0.2.3

@@ -15,7 +15,10 @@
 
 # database adapters
 optional_gem 'therubyracer', platform: :ruby
 optional_gem 'therubyrhino', platform: :jruby
 
+# optional c extensions
+optional_gem 'concurrent-ruby-ext', platform: :ruby
+
 # Specify your gem's dependencies in google-web-translate.gemspec
 gemspec