fix readme command typo
fix readme command typo

MajorMJR/factorio-server-manager,MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager