- Merge MKV files in `downloads_dir`. (fixes https://github.com/trizen/youtube-viewer/issues/282)
- Merge MKV files in `downloads_dir`. (fixes https://github.com/trizen/youtube-viewer/issues/282)

Previously, due to a bug, the MKV file was always created in the `pwd`. This should be fixed now.

Many thanks to Matthias Braun (@mb720) for finding and reporting this issue.

trizen/youtube-viewer,trizen/youtube-viewer