NEW YORK (Reuters) - Postmates Inc has revived plans for an initial public offering (IPO) following a string of dealmaking in the U.S. online food delivery service sector, people familiar with the matter said on Monday.Postmates registered its IPO confidentially with the U.S. Securities and Exchange Commission in February 2019, but did not proceed with a stock market debut. Just Eat Takeaway.com NV's $7.3 billion deal to acquire GrubHub Inc earlier this month, as well as recent fundraisings by..