Notice of Designation of a Longer Period for Commission Action on a Proposed Rule Change, as Modified by Amendment Nos. 1 and 2, to BATS Rule 14.11(i), Managed Fund Shares, To List and Trade Shares of the REX VolMAXX Long VIX Weekly Futures Strategy ETF and the REX VolMAXX Inverse VIX Weekly Futures Strategy ETF of the Exchange Traded Concepts Trust