By Karolos Grohmann PARIS (Reuters) – American teenager Coco Gauff appealed for an end to gun violence in the United States on Thursday after she beat Italian Martina Trevisan to reach the French Open final. In a message written on an on-court camera at the end of the match, the 18-year-old wrote “Peace End Gun Violence” followed by a heart. “I think I am in a mind now like it does not matter,” Gauff said when asked about pressure ahead of Saturday’s final — her first in a Grand Slam — against top seed Iga Swiatek. “I am going to be happy regardless. My parents are going to love me regardles…