Webvtt-py

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* Added voice span support (55)
* Extended from_buffer support to allow BytesIO and also other format conversions (32)
* Fixed save SRT to not include cue tags, thanks to `lilaboc <https://github.com/lilaboc>`_ (#56)
* Fixed saved caption to include a line break after the last caption as per standard (49)

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* Added styles support
* Added comments support
* Added from_string
* Added iterate over a slice of captions
* Refactor of the library
* Parser is no longer strict and ignores malformed blocks
* Improved BOM support allowing to keep the BOM or remove it
* Deprecated read_buffer in favor of from_buffer
* Removed support for old versions of Python: 3.4, 3.5 and 3.6

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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)