Turquoise Hill: Bernstein Litowitz Berger & Grossmann LLP Announces Pendency and Proposed Settlement of Class Action Involving Persons and Entities who Purchased or Otherwise Acquired Turquoise Hill Resources Ltd. Common Stock, Swaps, or Call Options or Sold Put Options in Domestic Transactions or on U.S. Exchanges During the Period from July 17, 2018 through July 31, 2019