Webvtt-py

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* Add capability to get WebVTT formatted content without an output file, thanks to `DawoudSheraz <https://github.com/DawoudSheraz>`_ (34)
* Add Python 3.9 support

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* Fix issue reading buffer

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* Allow parsing empty SBV captions, thanks to `ishunyu <https://github.com/ishunyu>`_ (26)
* Fix invalid time cues, thanks to `sontek <https://github.com/sontek>`_ (19)
* Enable pytest as test runner, thanks to `sontek <https://github.com/sontek>`_ (20)
* Packaging improvements
* Added Python 3.8 support
* Improve parsing empty lines

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* Parsing improvements, thanks to `sontek <https://github.com/sontek>`_ (18)
* Add support for reading content from a file-like object, thanks to `omerholz <https://github.com/omerholz>`_ (23)
* Documentation fixes thanks to `sontek <https://github.com/sontek>`_ (22) and `netcmcc <https://github.com/netcmcc>`_ (24)

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* Renamed and reorganized few of the modules
* Parsing methods are now class methods: read, from_srt and from_sbv
* Improved usability with the addition of shortcuts to avoid instantiating the classes so we can do:

import webvtt

webvtt.read('captions.vtt') this will return a WebVTT instance

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* Support for saving cue identifiers