Update Gemfile.

temp_file/Gemfile

@@ -8,8 +8,10 @@ if $0.to_s.scan('bundle').length==0
 end
 if RUBY_VERSION.to_f <= 2.1
   gem 'concurrent-ruby', '1.1.9'
+  gem 'signet', '0.11.0'
 else
   gem 'concurrent-ruby'
+  gem 'signet'
 end
 #built in modules
 eval(File.read(File.dirname(__FILE__) + '/built_in_extensions.rb'))