Sphinxcontrib-youtube

* Correct the Sphinx version dependency.

* Add support for PeerTube
* Various minor big fixes

* Code and documentation refactor
* Contributing instructions
* Installation and configuration instructions
* Only download thumbnails for LaTeX targets.
* Fix to thumnail folder name.
* parallel build safety.

Some additional new features, with thanks to the users who contributed them:

* Thumbnail images are now available in LaTeX output.
* Privacy mode can now be specified for videos.
* The documentation is now on Read the docs.

Some user-contributed features:

* :align: attribute
* support for timestamps and other url parameters.
* Additions to the README file.

Release compatible with unmaintained, old Python versions.

At the request of a user, this is a release in which the f-strings have been removed in order to be Python 3.5 compatible. Python 3.5 is now out of maintenance and shouldn't really be used. Future releases of sphinx-contrib/youtube will only attempt to maintain compatibility with Python versions that are yet to reach end of life status.