def versions(id)
      wf_alert_id?(id)
      resp = api.get([id, 'history'].uri_concat)

      versions = resp.response.items.map(&:version)
      resp.response[:items] = versions
      resp
    end
def versions(id)
      wf_alert_id?(id)
      resp = api.get([id, 'history'].uri_concat)

      versions = resp.response.items.map(&:version)
      resp.response[:items] = versions
      resp
    end
Gets all the versions of the given alert
 @param id [String] ID of the alert
 @reutrn [Wavefront::Resonse] where items is an array of integers