Python-barcode

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* Added basic support for multiline text.
* Dropped lots of older compat-only code and other cleanups.
* Fixed a bug in the API when combining certain barcodes and writers.
* Published documentation again and updated all project references.
* Fix python_barcode.get mixups between `options` as `writer_options`.
Previously, some writer/barcode combinations worked fine, while others
failed. Now all work consistently.
* The cli tool has been fixed and should now work as expected again.

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* Added support for GS1-128.

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* Officially support Python 3.7
* Refer to Pillow in the docs, rather than PIL.

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* Removed buggy ``Barcode.raw`` attribute.
* Various CLI errors ironed out.
* Make the default value for ``writer_options consistent across writers.

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* Fix pushing of releases to GitHub.

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* Fix crashes when attempting to use the CLI app.
* Properly include version numbers in SVG comments.