Ruby 2.0 syntax is used but GemSpec doesn't specify Ruby 2.0 as required

[jstangroome]

In ssh.rb the Ruby 2.0 keyword parameter syntax is used:
https://github.com/cloudspace/ruby-fleetctl/blob/master/lib/fleetctl/runner/ssh.rb#L4

In Ruby 1.9 this is not supported and reports an error:

/gems/fleetctl-0.1.4/lib/fleetctl/runner/ssh.rb:4: syntax error, unexpected tLABEL, expecting ')' (SyntaxError)
      def run(host: Fleetctl.options.fleet_host,...
                   ^

Can either (a) the gemspec file be changed to specify that ruby-fleetctl requires Ruby 2.0 or (b) the ssh.rb file, and any other occurrences of Ruby 2.0-only syntax be changed to use Ruby 1.9 compatible alternatives?