When's the end of maintenance in the  august 11, 2013 release date?
CREATE TABLE "version_history" (
  "version" text,
  "release" text,
  "release_date" text,
  "end_of_maintenance" text,
  "requirement" text
);
SELECT "end_of_maintenance" FROM "version_history" WHERE "release_date"='August 11, 2013';