rubocop security scan is run as part of the test rake target

Rakefile

@@ -276,6 +276,11 @@ task :java_debug do
 end
 Rake::Task[:test].prerequisites << :java_debug
 
+task :rubocop_security do
+  sh "rubocop lib --only Security"
+end
+Rake::Task[:test].prerequisites << :rubocop_security
+
 if Hoe.plugins.include?(:debugging)
   ['valgrind', 'valgrind:mem', 'valgrind:mem0'].each do |task_name|
     Rake::Task["test:#{task_name}"].prerequisites << :compile