title: DEPRECATION NOTICE while trying to launch selenium chrome driver using nightwatch
body: <p>I use chromedriver with nightwatch for my web-ui testing. Things were working until i got this message. How do i get around this issue  </p>
  
  <pre><code>DEPRECATION NOTICE: Property chrome_driver is deprecated since v0.5.    
  Please use the "cli_args" object on the "selenium" property to define 
  "webdriver.chrome.driver". E.g.:
  {
      "cli_args": {
      "webdriver.chrome.driver": 
          "&lt;VALUE&gt;"
      }
  } 
  </code></pre>