v2.3.1

- fix using swipe up/down when move/delete is disabled
- add toggle toolbar button “mostly for mobile users”
- smooth scroll navigation
- better/accurate progress bar for upload
- fix not changing animation direction for swiping
- fix not reseting current selected file index
- you can now preview pdfs too
- fix https://github.com/ctf0/Laravel-Media-Manager/issues/20