Mike GreenawayThe Lions have said they want to be taken seriously as United Rugby Championship (URC) contenders and while that remains a touch ambitious, how they beat the Dragons yesterday suggests they could get there.The Lions yesterday won their tour opener 23-19 and showed a maturity in their game that was absent last season. Simply put, the Lions team of the previous URC campaign would have lost this game but yesterday they had the composure to close out a very tight game.The Lions have now beaten Ulster 35-22, Edinburgh 55-21 and the Dragons. They will travel to Zebre this week high…