3.0.0 rubocop changes to matches? create issues in 2.3 ruby based sensu

[crscybr]

See sensu-plugins/sensu-plugins-raid-checks#18 for a similar issue.

The latest updates to sensu-plugins-process-checks breaks in ruby versions 2.3 supplied by
sensu-0.26.5-2.x86_64

/opt/sensu/embedded/bin/ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]

/opt/sensu/embedded/bin/check-process.rb -p init

Check failed to run: undefined method `zero?' for #<Process::Status: pid 29557 exit 1>, ["/opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-process-checks-3.0.0/bin/check-process.rb:211:in `on_cygwin?'", "/opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-process-checks-3.0.0/bin/check-process.rb:217:in `acquire_procs'", "/opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugins-process-checks-3.0.0/bin/check-process.rb:252:in `run'", "/opt/sensu/embedded/lib/ruby/gems/2.3.0/gems/sensu-plugin-1.4.2/lib/sensu-plugin/cli.rb:58:in `block in <class:CLI>'"]