message: updated slide.slideNumber to new setter style
diff: @@ -2311,7 +2311,7 @@ function genSlides_Image(pptx) {
  {
  var slide = pptx.addSlide();
  slide.addNotes('API Docs: https://gitbrent.github.io/PptxGenJS/docs/api-images.html');
  - slide.slideNumber({ x:'50%', y:'95%', color:'0088CC' });
  + slide.slideNumber = { x:'50%', y:'95%', color:'0088CC' };
  slide.addTable( [ [{ text:'Image Examples: Misc Image Types', options:gOptsTextL },gOptsTextR] ], gOptsTabOpts );
  // TOP: 1
  @@ -2360,7 +2360,7 @@ function genSlides_Image(pptx) {
  {
  var slide = pptx.addSlide();
  slide.addNotes('API Docs: https://gitbrent.github.io/PptxGenJS/docs/api-images.html');
  - slide.slideNumber({ x:'50%', y:'95%', color:'0088CC' });
  + slide.slideNumber = { x:'50%', y:'95%', color:'0088CC' };
  slide.addTable( [ [{ text:'Image Examples: Image URLs', options:gOptsTextL },gOptsTextR] ], gOptsTabOpts );
  // TOP-LEFT:
  @@ -2393,7 +2393,7 @@ function genSlides_Image(pptx) {
  {
  var slide = pptx.addSlide();
  slide.addNotes('API Docs: https://gitbrent.github.io/PptxGenJS/docs/api-images.html');
  - slide.slideNumber({ x:'50%', y:'95%', w:1, h:1, color:'0088CC' });
  + slide.slideNumber = { x:'50%', y:'95%', w:1, h:1, color:'0088CC' };
  slide.addTable( [ [{ text:'Image Examples: Image Sizing/Rounding', options:gOptsTextL },gOptsTextR] ], gOptsTabOpts );
  // TOP: 1
  