Setting user-agent for PhamtomJS in Codeception

class_name: WebGuy
modules:
        enabled:
                - WebHelper
                - WebDriver
        config:
                WebDriver:
                        url: 'http://build2.domain/'
                        browser: 'phantomjs'
                        port: 9988
                        capabilities:
                                phantomjs.page.settings.userAgent: "Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1667.0 Safari/537.36"