By Jonathan Allen (Reuters) -One of the three white men convicted of murdering Ahmaud Arbery pleaded guilty to federal hate-crime charges on Monday, admitting for the first time he chased the 25-year-old Black man because of his race. Travis McMichael changed his plea at a hearing in the U.S. District Court in Brunswick, Georgia, after reaching a plea deal with federal prosecutors. He pleaded guilty to using a gun in his attempt to apprehend Arbery because of his “race and color,” resulting in Arbery’s death. His father, Gregory McMichael, was also due to plead guilty as part of an agreement a…