Update to 0.13.0-beta1
* Python 3 compatibility: should work with Python 2.7 and >= 3.6 now
* Win32 build uses 64-bit Python 3
* improved support for non-ASCII characters in page titles (as extracted
* with pdftk)
* fixed box-zoom mode display error in half-page mode
* added option to set last page of page progress bar (--progress-last)
* added separate overview animation time option (--overtime)
* can now have multiple progress bars at once
- page progress is moved to top of screen if any other bar is visible
- "auto progress" is stacked over duration bar if both are visible