Derby County took one step into the Championship with a narrow 1-0 victory over Cambridge United this afternoon, breaking one impressive club record in the process. Derby County knew before the game they needed just four points from their final two games to secure promotion. The Rams secured three points against Cambridge thanks to a composed finish from Nathaniel Mendez-Laing after Louie Sibley set him away with a superb pass. Although Bolton Wanderers beat Port Vale 2-0 and Peterborough United overcame Bristol Rovers by the same margin, only a point is needed against relegated Carlisle Unite…