Changes in version 0.1.0 (2021-09-15)                  

  - Add optional notes argument to new_slide() for attaching speaker
    notes to a slide. Notes are written into the pptx's notes slide via
    officer::set_notes().

  - Add empty content to slides when writing presentation to use
    auto-numbered slides (see officer:429)

  - Allow custom locations by using new_location() when calling
    new_element(). The R2PptxLocation class is now exported. The
    R2PptxLocation class has slots ph_location_fn (function) and args
    (list) instead of the location character slot (#8).

  - R2PptxSlideList improvements (#3)
    
      - Added + method to add R2PptxSlideList objects to R2PptxSlideList
        objects
    
      - Added new_slidelist() to create new slide list objects