message: updated to replace deprecated bkgd prop
diff: @@ -30,7 +30,7 @@ export function testMainMethods() {
  // PPTX Method 2:
  pptx.defineSlideMaster({
  title: "MASTER_SLIDE",
  - bkgd: "FFFFFF",
  + background: { fill: "FFFFFF" },
  margin: [0.5, 0.25, 1.0, 0.25],
  slideNumber: { x: 0.6, y: 7.0, color: "FFFFFF", fontFace: "Arial", fontSize: 10, align: pptx.AlignH.center },
  objects: [
  