message: updated `writeFile` for new props option from Pull
diff: @@ -155,7 +155,7 @@ let textboxOpts = { x: 1, y: 1, color: "363636" };
  slide.addText(textboxText, textboxOpts);
  // 4. Save the Presentation
  -pres.writeFile("Sample Presentation.pptx");
  +pres.writeFile();
  ```
  ### Script/Web Browser
  @@ -173,7 +173,7 @@ let textboxOpts = { x: 1, y: 1, color: "363636" };
  slide.addText(textboxText, textboxOpts);
  // 4. Save the Presentation
  -pres.writeFile("Sample Presentation.pptx");
  +pres.writeFile();
  ```
  That's really all there is to it!
  @@ -209,7 +209,7 @@ Easily convert HTML tables to PowerPoint presentations in a single call.
  ```javascript
  let pptx = new PptxGenJS();
  pptx.tableToSlides("tableElementId");
  -pptx.writeFile("HTML2PPT.pptx");
  +pptx.writeFile();
  ```
  Learn more:
  