By Daniel Kline The fast-food giant has made a big change and customers should be delighted. Fast food has always been a reactionary business. McDonald’s (MCD) – Get McDonald’s Corporation Report created the Big Mac in response to the success that Burger King had with the Whopper. Pretty much since that happened, when one chain does something, the other chain responds. That’s why the menus at McDonald’s, Restaurant Brands International’s (QSR) – Get Restaurant Brands International Inc. Report Burger King, and Wendy’s (WEN) – Get Wendy’s Company (The) Report have a general sameness to them. Eve…