* Use certificates from `certifi` if installed by [coletdjnz](https://github.com/coletdjnz)
* Treat multiple `--match-filters` as OR
* File locking improvevemnts:
* Do not lock downloading file on Windows
* Do not prevent download if locking is unsupported
* Do not truncate files before locking by [jakeogh](https://github.com/jakeogh), [pukkandan](https://github.com/pukkandan)
* Fix non-blocking non-exclusive lock
* De-prioritize automatic-subtitles when no `--sub-lang` is given
* Exit after `--dump-user-agent`
* Fallback to video-only format when selecting by extension
* Fix `--abort-on-error` for subtitles
* Fix `--no-overwrite` for playlist infojson
* Fix `--print` with `--ignore-no-formats` when url is `None` by [flashdagger](https://github.com/flashdagger)
* Fix `--sleep-interval`
* Fix `--throttled-rate`
* Fix `autonumber`
* Fix case of `http_headers`
* Fix filepath sanitization in `--print-to-file`
* Handle float in `--wait-for-video`
* Ignore `mhtml` formats from `-f mergeall`
* Ignore format-specific fields in initial pass of `--match-filter`
* Protect stdout from unexpected progress and console-title
* Remove `Accept-Encoding` header from `std_headers` by [coletdjnz](https://github.com/coletdjnz)
* Remove incorrect warning for `--dateafter`
* Show warning when all media formats have DRM
* [downloader] Fix invocation of `HttpieFD`
* [http] Fix #3215
* [http] Reject broken range before request by [Lesmiscore](https://github.com/Lesmiscore), [Jules-A](https://github.com/Jules-A), [pukkandan](https://github.com/pukkandan)
* [fragment] Read downloaded fragments only when needed by [Lesmiscore](https://github.com/Lesmiscore)
* [http] Retry on more errors by [coletdjnz](https://github.com/coletdjnz)
* [mhtml] Fix fragments with absolute urls by [coletdjnz](https://github.com/coletdjnz)
* [extractor] Add `_perform_login` function
* [extractor] Allow control characters inside json
* [extractor] Support merging subtitles with data by [coletdjnz](https://github.com/coletdjnz)
* [generic] Extract subtitles from video.js by [Lesmiscore](https://github.com/Lesmiscore)
* [ffmpeg] Cache version data
* [FFmpegConcat] Ensure final directory exists
* [FfmpegMetadata] Write id3v1 tags
* [FFmpegVideoConvertor] Add more formats to `--remux-video`
* [FFmpegVideoConvertor] Ensure all streams are copied
* [MetadataParser] Validate outtmpl early
* [outtmpl] Fix replacement/default when used with alternate
* [outtmpl] Limit changes during sanitization
* [phantomjs] Fix bug
* [test] Add `test_locked_file`
* [utils] `format_decimal_suffix`: Fix for very large numbers by [s0u1h](https://github.com/s0u1h)
* [utils] `traverse_obj`: Allow filtering by value
* [utils] ExtractorError: Fix for older python versions
* [utils] WebSocketsWrapper: Allow omitting `__enter__` invocation by [Lesmiscore](https://github.com/Lesmiscore)
* [docs] Add an `.editorconfig` file by [fstirlitz](https://github.com/fstirlitz)
* [docs] Clarify the exact `BSD` license of dependencies by [MrRawes](https://github.com/MrRawes)
* [docs] Minor improvements by [pukkandan](https://github.com/pukkandan), [cffswb](https://github.com/cffswb), [danielyli](https://github.com/danielyli)
* [docs] Remove readthedocs
* [build] Add `requirements.txt` to pip distributions