updating description with ruby-jira

foo.rb

require 'jira'

options = {
    :username => username,
    :password => password,
    :site     => 'https://XXXXXX.atlassian.net/',
    :context_path => '',
    :auth_type => :basic
}

client = JIRA::Client.new(options)
issue = client.Issue.find('TES-116')

issue.save({:fields=>{:description=>"EVEN MOOOOOOARRR NINJAAAA!"}})