Stock trading platform Robinhood has announced its newest offering: the Robinhood Platinum Card.  The upgraded option comes two years after the company unveiled its first credit card, the Gold Card. “We built the Gold Card to be the best card for everyday spending, and customer demand showed us there was room to push the boundaries even further,” Deepak Rao, the vice president and general manager of Robinhood Money, said in the announcement. “The Platinum Card offers higher limits, elite...