Fix CVE-2020-8130

There is an OS command injection vulnerability in Ruby Rake before 12.3.3 in Rake::FileList when supplying a filename that begins with the pipe character |.

Author: Warshavski

rubycent.gemspec

@@ -39,7 +39,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'multi_json', '~> 1.13.1'
 
   spec.add_development_dependency 'bundler'
-  spec.add_development_dependency 'rake', '~> 10.0'
+  spec.add_development_dependency 'rake', '>= 12.3.3'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'webmock', '~> 3.7.5'
 end