Log Message:
py-cairosvg: Update to 2.4.2.

Version 2.4.2 released on 2019-09-10
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* Fix race condition in tests
* Fix scale for images with no viewBox

Version 2.4.1 released on 2019-08-21
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* Fix the --scale parameter
* Allow href attributes with no namespace
* Fix the tree root detection

Version 2.4.0 released on 2019-05-20
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* Fix aspect and position when resizing root SVG tag
* Follow aspect and position hints when using forced output size

Version 2.3.1 released on 2019-04-18
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* Fix relative paths on Windows

Version 2.3.0 released on 2019-02-08
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* Drop Python 3.4 support
* Make text selectable on generated PDF files
* Don't inherit dx and dy attributes
* Fix support of alignment-baseline="hanging"
* Fix backslashes in docstrings and comments
* Fix local anchors with files with no given URL
* Close VERSION's file descriptor
* Clean packaging
* Include LICENSE in distributed packages

Version 2.2.1 released on 2018-09-27
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* Fix packaging

Version 2.2.0 released on 2018-09-21
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* Clean packaging
* Fix T commands used with previous relative commands in paths
* Use real functions for svg2* commands, improving IDE integration
* Fix files management on Windows
* Handle image-rendering property
* Fix crash with some text samples
* Fix position of embedded svg tags with a viewbox not at position (0, 0)
* Add output-width and output-height options
* Handle references to inner document tags defined after the anchor
* Fix offsets for texts on paths