Log Message:
gallery-dl: Update net/gallery-dl to 1.6.0

Changes:
1.6.0
-----
- Add wallhaven extractor
- Add yuki extractor
- Add a ytdl (youtube-dl) downloader to download media via youtube-dl
  (Unfortunately at the moment youtube-dl package is not a multipackage (we do
  not have py{27,34,35,37}-youtube-dl so this will work only if youtube-dl was
  built with the same PYTHON_VERSION_DEFAULT of gallery-dl))
- Add '--no-check-certificate' command-line option
- Misc bug fixes and improvements