Uber is quietly rolling out a new way to pay: cash. The company, long associated with card-only payments, has begun letting riders hand drivers bills at the end of trips. The feature started small in places like Cincinnati and San Antonio, but has since expanded into bigger markets, including Los Angeles, San Diego, Tampa, and Jacksonville. Even smaller cities like Laredo, Texas, are part of the rollout. Riders still book through the app, but instead of charging a card, they settle up with ca...