Dish Network’s Sling TV, the live streaming service, is now available on the $35 Google Chromecast and is appropriately using the announcement to promote itself, by offering a two month free trial for new Sling TV customers using Chromecast, as well as a free Chromecast device with a three month prepay of its ‘Best of Live TV’ product. Sling TV’s addition to Chromecast was originally announced in September, after the updated version 2.0 dongles were unveiled – with the design changing from a simple stick to a round, colorful disk, to house new features such as an integrated HDMI cable. Sling TV starts at $20 a month, and joins the likes of Netflix, Hulu, HBO Now, Google Play Movies, YouTube,…