ST. LOUIS — Aledmys Diaz made a vow Monday to the family of childhood friend Jose Fernandez, the late Miami Marlins ace who died in a boating accident early Sunday. “I told them that every single time I put on the uniform, I would be thinking of him,” Diaz said. “And that I would give 100 percent because that’s how he played the game.” Fernandez would have been proud of his longtime buddy on Tuesday night. Back in the lineup after attending a private ceremony for Fernandez in Florida on Monday, Diaz hit his first career grand slam and the St.