COMMISSION DELEGATED REGULATION (EU) 2019/396 of 19 December 2018 amending Delegated Regulation (EU) 2015/2205, Delegated Regulation (EU) 2016/592 and Delegated Regulation (EU) 2016/1178 supplementing Regulation (EU) No 648/2012 of the European Parliament and of the Council as regards the date at which the clearing obligation takes effect for certain types of contracts