By Jonathan Stempel NEW YORK (Reuters) -Visa and Mastercard announced a revised settlement with merchants who accused the card networks of charging too much to accept their credit cards, after a judge rejected an earlier ​$30 billion accord as inadequate. Monday's settlement would end 20 years of litigation where businesses accused Visa, Mastercard and ‌banks of conspiring to violate U.S. antitrust laws, including through the card networks' collection of "swipe fees" to process transactions. The accord, ...