- Added support for:
- `wallhaven` - https://alpha.wallhaven.cc/
- `yuki` - https://yuki.la/
- Added youtube-dl integration and video downloads for `twitter` ([99](https://github.com/mikf/gallery-dl/issues/99)), `behance`, `artstation`
- Added per-extractor options for network connections (`retries`, `timeout`, `verify`)
- Added a `--no-check-certificate` command-line option
- Added ability to specify the number of skipped downloads before aborting/exiting ([115](https://github.com/mikf/gallery-dl/issues/115))
- Added extractors for scraps, favorites, popular and recent images on `hentaifoundry` ([110](https://github.com/mikf/gallery-dl/issues/110))
- Improved login procedure for `pixiv` to avoid unwanted emails on each new login
- Improved album metadata and error handling for `flickr` ([109](https://github.com/mikf/gallery-dl/issues/109))
- Updated default User-Agent string to Firefox 62 ([122](https://github.com/mikf/gallery-dl/issues/122))
- Fixed `twitter` API response handling when logged in ([123](https://github.com/mikf/gallery-dl/issues/123))
- Fixed issue when converting Ugoira using H.264
- Fixed miscellaneous issues for `2chan`, `deviantart`, `fallenangels`, `flickr`, `imagefap`, `pinterest`, `turboimagehost`, `warosu`, `yuki` ([112](https://github.com/mikf/gallery-dl/issues/112))