By Belinda Goldsmith LONDON, July 6 (Reuters) – World number one Novak Djokovic has slipped up with his footwear at Wimbledon, being told to get rid of the pimples on the side of his shoes days before he faces Briton Andy Murray in the final on Sunday. Djokovic was the second of the top four male players to fall foul of footwear rules at Wimbledon after seven-times champion Roger Federer was told to change his orange-soled shoes. …
