Combine sugars, pumpkin puree, oil, maple syrup and eggs in a medium bowl, stirring with a whisk until thoroughly combined. Add liquid ingredients to dry ingredients, stirring with a spoon, just until combined. (Don't overmix or your bread will turn out tough.) Gently fold in nuts and raisins. Scrape batter into a 9-by-5-inch loaf pan coated with cooking spray.